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WorksheetsEndocrine Vocabulary slide (1-30)
Total questions: 114
Worksheet time: 57mins
Which term refers to chemical messengers released by neurons to communicate across synapses?
Hormones
Neurotransmitters
Target cells
Molecules
Which structure is specifically the cell that a hormone is intended to affect?
Pituitary
Target cell
Pancreatic islet
Thymus
Which glands are located above the kidneys and are associated with the stress response?
Thyroid glands
Adrenal glands
Pineal glands
Parathyroid glands
Which endocrine organ is classically known as the 'master gland' because it influences many other glands?
Pancreas
Pituitary
Thyroid
Ovaries
Which feedback mechanism reduces the initial stimulus to maintain homeostasis?
Positive feedback
Negative feedback
Secretion
Exocrine
Which term best describes hormones that pass through cell membranes to bind intracellular receptors?
Water-soluble
Lipid-soluble
Pancreatic islet
Exocrine
Which endocrine structure contains clusters of cells that regulate blood glucose levels?
Thyroid follicles
Pancreatic islets
Pineal gland
Adrenal cortex
Which gland primarily regulates metabolic rate through its hormones?
Thyroid
Parathyroid
Testes
Thymus
Which choice correctly pairs the reproductive organs with their classification as endocrine glands?
Ovaries and testes are exocrine only
Ovaries and testes function as endocrine glands
Ovaries are endocrine; testes are not
Neither ovaries nor testes are endocrine
Which process describes the release of substances from a cell, such as hormones, into the bloodstream?
Secretion
Negative feedback
Stress response
Disorder
Which statement best describes how the nervous and endocrine systems coordinate body functions?
They work independently, each controlling different organs exclusively.
They act together to coordinate all systems of the body.
Only the endocrine system coordinates body systems while the nervous system transmits pain.
The nervous system coordinates movement while the endocrine system coordinates only digestion.
What type of signaling molecule is released by the nervous system?
Enzymes
Neurotransmitters
Hormones
Antibodies
Which mechanism correctly describes how most hormones exert their effects?
They are released at synapses and act only locally without entering blood.
They circulate through the blood and bind to receptors on target cells.
They directly alter DNA without binding to receptors.
They function as structural proteins in target cells.
Both hormones and neurotransmitters share which feature regarding their action on cells?
They are stored in bone tissue before release.
They bind to receptors on target cells.
They only act on the cells that secrete them.
They do not require receptors to produce effects.
According to the diagram overview of the endocrine system, which gland is located deep in the brain and often associated with regulating circadian rhythms?
Pituitary gland
Thyroid gland
Pineal gland
Adrenal gland
Pancreas
Which option best identifies the endocrine gland situated at the base of the brain, just below the hypothalamus, as indicated in the diagram?
Pineal gland
Pituitary gland
Adrenal glands
Gonads
Pancreas
Using the diagram, select the pair that correctly matches a gland to its general location in the body.
Thyroid — within the cranial cavity
Adrenal glands — atop the kidneys in the upper abdomen
Pancreas — in the thoracic cavity behind the sternum
Gonads — in the cervical region of the neck
Pineal gland — in the pelvic cavity
A student claims the pancreas is part of the endocrine system and is located in the mid-abdomen. Based on the gland overview diagram, which evaluation is most accurate?
Incorrect: the pancreas is not an endocrine organ and is in the thorax
Correct: the pancreas has endocrine function and is located in the mid-abdomen
Partially correct: the pancreas is endocrine but located in the neck
Incorrect: the pancreas is only exocrine and is near the kidneys
Correct: the pancreas is endocrine but located in the pelvic cavity
Which statement best describes the molecules used by the nervous system for communication?
Hormones circulated by the blood to distant tissues
Neurotransmitters released locally in response to nerve impulses
Enzymes secreted into the digestive tract
Steroids stored in adipose tissue
Where do neurotransmitters primarily bind to exert their effects?
Receptors in postsynaptic membranes at synapses
Receptors on erythrocytes in the bloodstream
Nuclear pores of all cells
Mitochondrial membranes of muscle cells
Which description matches the endocrine system’s typical site of action?
Close to the site of release at a synapse
Far from the site of release, binding to receptors on or in target cells
Only within skeletal muscle fibers
Exclusively within gland cells
Which set correctly identifies the common targets of the nervous system?
Cells throughout the body without specificity
Muscle (smooth, cardiac, skeletal) cells, gland cells, and other neurons
Only endocrine glands
Only epithelial cells
What is the typical time to onset of action for the nervous system compared to the endocrine system?
Nervous: seconds to days; Endocrine: milliseconds
Nervous: milliseconds; Endocrine: seconds to hours or days
Both: milliseconds
Both: seconds to hours
Which statement best contrasts the duration of action between the two systems?
Nervous actions are generally longer (seconds to days); endocrine actions are brief (milliseconds)
Both systems have identical durations
Nervous actions are generally briefer (milliseconds); endocrine actions are longer (seconds to days)
Endocrine actions are instantaneous
A signaling molecule travels through the blood to reach receptors inside a distant target cell. Which system is most likely involved?
Nervous system
Endocrine system
Digestive system
Immune system
A fast, localized response occurs at a synapse and ends within milliseconds. Which mechanism most accurately explains this event?
Hormone binding in distant tissues
Neurotransmitter release in response to a nerve impulse, binding to postsynaptic receptors
Genetic transcription changes in target cells
Paracrine signaling via blood-borne cytokines
Which endocrine gland is located posterior to the thyroid gland in the neck?
Pineal gland
Parathyroid glands
Pituitary gland
Thymus
In the anatomical diagram, which structure sits just superior to the pituitary gland within the brain?
Thyroid gland
Hypothalamus
Pineal gland
Adrenal gland
Which pair of endocrine glands is shown capping the kidneys?
Adrenal glands
Parathyroid glands
Ovaries
Pancreas
According to the diagram, which endocrine organ is located in the upper abdomen and lies near the small intestine?
Thymus
Pancreas
Thyroid gland
Pineal gland
Which option correctly matches the endocrine gland to its general location in the diagram?
Ovary—male scrotum
Thymus—anterior mediastinum above the heart
Pituitary gland—on top of the kidneys
Pineal gland—anterior neck near the trachea
Which statement best explains why a hormone affects only certain cells in the body?
All cells respond equally to any hormone in the bloodstream.
Only target cells with specific protein receptors for the hormone respond.
Hormones must be physically injected into cells to have an effect.
Hormones only act on cells located near the endocrine gland.
What happens to receptor numbers when a cell is exposed to high concentrations of a hormone for a prolonged time?
Receptors are up-regulated, increasing sensitivity.
Receptors stop being synthesized entirely.
Receptors are down-regulated, decreasing sensitivity.
Receptors convert into enzymes.
Which process describes increasing the number of receptors in response to low hormone concentrations?
Down-regulation
Up-regulation
Desensitization
Internalization
According to the diagram of circulating hormones, what enables distant target cells to respond to a hormone transported in the blood?
Presence of hormone receptors on the target cells
Direct physical contact with the endocrine cell
Higher temperature in capillaries
Larger cell size compared to non-target cells
Which statement is consistent with the idea that receptors are continually being synthesized and broken down?
Receptor number on a cell is fixed and cannot change.
Cells can adjust receptor density in response to hormone levels.
Hormone binding permanently activates a receptor.
Receptors only exist on endocrine cells.
A patient has chronically low circulating levels of a particular hormone. Which cellular change would most likely improve responsiveness to that hormone?
Decreasing receptor synthesis
Increasing receptor degradation
Up-regulating receptor expression on target cells
Eliminating receptors to conserve energy
In the context of circulating hormones, which pathway correctly traces the movement and action of a hormone as depicted?
Target cell releases hormone into interstitial fluid, which diffuses into neighboring cells without receptors.
Endocrine cell releases hormone into blood capillary; hormone travels and binds receptors on distant target cells.
Endocrine cell stores hormone in target cells until needed.
Hormone forms inside target cells and exits to activate the endocrine cell.
Which statement best defines local hormones (paracrines)?
Hormones that circulate widely in the bloodstream
Hormones that do not circulate and act on nearby target cells
Hormones that only act on distant organs
Hormones that are always protein-based
Autocrines are hormones that:
Act on the same cell that secretes them
Act only on distant organs via blood
Require transport proteins to move through plasma
Are always water-soluble
A signaling molecule released by a cell and binding to receptors on a neighboring cell is best classified as:
Autocrine
Paracrine
Endocrine circulating hormone
Neurotransmitter
Which group correctly lists examples of lipid-soluble hormones?
Amine hormones, peptide hormones, eicosanoid hormones
Steroid hormones, thyroid hormones, nitric oxide
Peptide hormones only
Catecholamines and insulin
Water-soluble hormones typically circulate in the plasma:
Bound to transport proteins
Embedded in cell membranes
Freely without being bound to proteins
Only when converted to steroids
Lipid-soluble hormones in the blood are most often:
Freely dissolved in plasma
Bound to transport proteins
Stored inside red blood cells
Converted to water-soluble forms before release
Which scenario best demonstrates the distinction between paracrine and autocrine signaling?
A hormone released into the bloodstream affecting the kidneys
A cell releasing a factor that binds receptors on its own surface
A cell releasing a factor that binds receptors on a nearby target cell
Neural transmission across a synapse
Which statement best explains why the same hormone can produce different responses in different target cells?
Target cells vary in receptor location and downstream machinery
Hormones randomly change their chemical structure in the bloodstream
All hormones act only through second messengers
Target cells do not contain receptors
Which of the following is listed as a possible cellular response to a hormone?
Decreasing receptor count only
Synthesis of new molecules
Elimination of all transport proteins
Permanent cell death
Changing permeability of the cell membrane in response to a hormone would most directly affect which process?
Gene expression in the nucleus
Movement of ions or molecules across the membrane
mRNA splicing
Ribosome assembly
Stimulating transport of a substance into or out of a cell is an example of which broader concept from the section?
Hormone response variability
Water-soluble hormone binding sites
Muscle contraction only
Negative feedback
According to the section, hormones can alter the rate of metabolic actions. Which outcome best illustrates this?
Activation of protein kinases increases glycogen breakdown
Insertion of new DNA into the genome
Loss of all ribosomes
Blocking all cell division permanently
Which response listed is specifically related to tissues such as smooth or cardiac muscle?
Synthesis of new molecules
Changing membrane permeability
Causing contraction
Stimulating apoptosis
Lipid-soluble hormones primarily bind to receptors located where?
On the exterior surface of the target cell
Within target cells
On blood capillary walls
Only on ribosomes
In the lipid-soluble hormone mechanism, what is the immediate effect of the activated receptor–hormone complex?
Activates adenylate cyclase
Alters gene expression
Generates cAMP
Phosphorylates cellular proteins
Which sequence best matches the diagram for lipid-soluble hormone action?
Hormone binds membrane receptor → cAMP forms → kinases activated
Hormone diffuses into cell → receptor–hormone complex alters gene expression → mRNA formed → ribosomes synthesize specific proteins → new proteins alter cell activity
Hormone remains outside cell → G protein activates adenylate cyclase → proteins phosphorylated
Hormone binds transporters on capillary → ADP produced → muscle contracts
Water-soluble hormones bind to receptors located where on the target cell?
Within the nucleus
Embedded in the cytosol
On the exterior surface of the target cell
Inside mitochondria
In the water-soluble hormone mechanism, what is the role of cAMP?
Acts as the first messenger outside the cell
Serves as a second messenger to activate protein kinases
Degrades proteins directly
Binds DNA to initiate transcription
Which step correctly links a component to its function in the water-soluble hormone pathway?
Phosphodiesterase converts ATP to cAMP
Adenylyl cyclase generates cAMP from ATP
Protein kinases are inactivated by cAMP
Receptor–hormone complex diffuses into the nucleus
Which factor directly affects how strongly a target cell responds to a hormone?
Dietary intake of minerals
The hormone’s concentration in the blood
The pH of the extracellular fluid
The temperature of the body
A hormone produces a stronger effect when another hormone assists it. What is this interaction called?
Permissive effect
Synergistic effect
Feedback inhibition
Antagonistic effect
Which scenario best illustrates an antagonistic effect between hormones?
Two hormones together produce a greater response than either alone
One hormone enables a second hormone to bind more receptors
One hormone decreases or opposes the action of another hormone
A hormone’s effect increases because its blood concentration is higher
A tissue shows a reduced response to a circulating hormone despite normal blood levels. Which explanation aligns with the mechanisms of hormone action described?
The number of hormone receptors on the target cell is low
The hormone is hydrophobic
Synergistic effects are always present
Body temperature is elevated
Which statement best describes how hormones are typically released into the bloodstream?
Continuously at a constant rate
In short bursts when needed
Only during sleep cycles
Only after meals
Which of the following is NOT listed as a regulator of hormone secretion?
Signals from the nervous system
Chemical changes in the blood
Other hormones
Genetic mutations in DNA
Most hormone regulation in the body is achieved primarily through which mechanism?
Positive feedback
Negative feedback
Feedforward control
Random secretion
Which feedback mechanism is described as used by only a few hormones?
Negative feedback
Positive feedback
Open-loop control
Autocrine signaling
A sudden drop in blood glucocorticoid levels triggers which immediate effect according to the regulation diagram?
Decreased CRH and increased cortisol
Increased CRH and decreased cortisol
Decreased ACTH release
Suppression of adrenal cortex activity
In the negative feedback loop regulating glucocorticoids, which structure acts as the control center?
Hypothalamic neurosecretory cells
Corticotrophs in anterior pituitary
Cells of zona fasciculata in adrenal cortex
Liver hepatocytes
During the glucocorticoid regulation pathway, which cells are identified as the effectors?
Hypothalamic neurosecretory cells
Corticotrophs in the anterior pituitary
Cells of the zona fasciculata in the adrenal cortex
Pancreatic beta cells
Which outcome completes the negative feedback cycle in glucocorticoid regulation?
Further decrease in glucocorticoid levels
Return to homeostasis when glucocorticoid levels in blood are brought back to normal
Permanent elevation of ACTH secretion
Switch to positive feedback to amplify the response
Which structure directly connects the hypothalamus to the pituitary gland?
Infundibulum
Pons
Corpus callosum
Pineal stalk
Thalamic peduncle
Which statement best describes the functional relationship between the hypothalamus and pituitary gland?
They work together to control other endocrine glands
They independently regulate only the nervous system
The pituitary controls hypothalamic hormone release
They function only during childhood
They store but do not release hormones
Which lobe of the pituitary makes up about 75% of its weight and secretes seven hormones?
Anterior lobe (adenohypophysis)
Posterior lobe (neurohypophysis)
Intermediate lobe
Pineal lobe
Hypothalamic lobe
What is the tissue origin of the posterior lobe (neurohypophysis)?
Neural tissue
Epithelial tissue
Muscle tissue
Connective tissue
Cartilaginous tissue
Which statement about posterior pituitary hormones is correct?
They are released by the posterior pituitary but made by the hypothalamus
They are synthesized and released by the posterior pituitary
They are synthesized by the anterior pituitary
They are made in the thyroid and stored in the pituitary
They are inhibited by the pineal gland
Which type of hypothalamic signals control hormone release from the pituitary gland?
Releasing and inhibiting hormones
Only neural action potentials
Digestive enzymes
Parathyroid factors
Erythropoietin
Human growth hormone (hGH) is primarily characterized in the material as which of the following?
The most plentiful anterior pituitary hormone
A steroid hormone stored in the posterior pituitary
A thyroid hormone released continuously
An adrenal cortex hormone
A pancreatic peptide secreted during fasting
What is the release pattern of hGH according to the material?
It is released in bursts every few hours
It is secreted only once daily
It is continuously secreted at a constant rate
It is released only during sleep
It is released only after meals
Which anterior pituitary cells release hGH, and which hypothalamic hormones regulate their activity?
Somatotrophs; GHRH stimulates and GHIH inhibits
Thyrotrophs; TRH stimulates and GHIH inhibits
Corticotrophs; CRH stimulates and TRH inhibits
Gonadotrophs; GnRH stimulates and GHRH inhibits
Lactotrophs; PRH stimulates and PIH inhibits
Which pairing correctly matches pituitary lobe with its alternate name?
Anterior lobe—adenohypophysis; Posterior lobe—neurohypophysis
Anterior lobe—neurohypophysis; Posterior lobe—adenohypophysis
Anterior lobe—pars nervosa; Posterior lobe—pars distalis
Anterior lobe—pineal; Posterior lobe—hypothalamic lobe
Anterior lobe—neuroendocrine; Posterior lobe—adenal
Which hypothalamic hormone directly stimulates the anterior pituitary to secrete growth hormone (GH)?
GHRH (growth hormone–releasing hormone)
GHIH (growth hormone–inhibiting hormone)
TRH (thyrotropin-releasing hormone)
CRH (corticotropin-releasing hormone)
According to the diagram, which condition would most likely increase GHRH release and promote GH secretion?
Hyperglycemia
Deep sleep
High blood levels of GH and IGFs
Aging
Which of the following is listed as a factor that suppresses GH secretion via GHIH?
Hypoglycemia
Decreased blood levels of fatty acids
Obesity
Increased blood levels of amino acids
GH acts on target tissues to stimulate the production of IGFs. Which tissue group is shown as a major source of IGFs in the diagram?
Adrenal cortex
Liver, bone, skeletal muscle, and cartilage
Pancreatic islets
Thyroid gland
Which metabolic state listed in the diagram is most likely to trigger the release of GHIH rather than GHRH?
Hypoglycemia
Increased blood levels of fatty acids
Decreased blood levels of amino acids
Deep sleep
After GH stimulates the release of IGFs, what primary physiological effect is indicated in the diagram?
Increased heart rate
Growth of bone, muscle, and other tissues
Decreased thyroid hormone levels
Inhibition of sympathetic activity
Which gland secretes human growth hormone (hGH), thyroid-stimulating hormone (TSH), follicle-stimulating hormone (FSH), luteinizing hormone (LH), prolactin (PRL), adrenocorticotropic hormone (ACTH), and melanocyte-stimulating hormone (MSH)?
Posterior pituitary gland
Anterior pituitary gland
Thyroid gland
Adrenal medulla
Growth hormone (GH) primarily stimulates which tissues to synthesize and secrete insulin-like growth factors (IGFs) that promote growth?
Kidney and pancreas
Liver, muscle, cartilage, bone, and other tissues
Thyroid gland
Adrenal cortex
Thyroid-stimulating hormone (TSH), also known as thyrotropin, has its principal action on which target tissue?
Adrenal cortex
Thyroid gland
Liver
Pancreatic islets
Which hormone from the anterior pituitary stimulates synthesis and secretion of thyroid hormones?
FSH
LH
TSH
ACTH
In females, follicle-stimulating hormone (FSH) primarily initiates development of oocytes and induces ovarian secretion of which hormones?
Progesterone only
Estrogens
Testosterone
Cortisol
In males, follicle-stimulating hormone (FSH) stimulates the testes to produce which cells?
Oocytes
Sperm
Red blood cells
Leydig cells
Which anterior pituitary hormone stimulates secretion of estrogens and progesterone and triggers ovulation in females?
FSH
LH
TSH
ACTH
In males, luteinizing hormone (LH) stimulates the testes to produce which hormone?
Estrogen
Progesterone
Testosterone
Cortisol
Which of the following is also called somatotropin?
TSH
FSH
GH
ACTH
Which pair correctly matches the anterior pituitary hormone to its principal action?
TSH—stimulates adrenal cortex to secrete cortisol
GH—stimulates IGF production that promotes growth of body tissues
FSH—triggers ovulation and progesterone secretion in females
LH—initiates development of oocytes and induces ovarian estrogen secretion
Which set lists only hormones secreted by the anterior pituitary gland?
ADH, oxytocin, TSH
TSH, FSH, LH, ACTH
Insulin, glucagon, GH
Epinephrine, norepinephrine, MSH
A patient has low thyroid hormone levels due to reduced pituitary stimulation. Which anterior pituitary hormone is most likely deficient?
GH
TSH
FSH
LH
Which target tissue is directly stimulated by GH to produce IGFs?
Thyroid gland
Liver
Adrenal cortex
Pancreas
Which statement best distinguishes the roles of FSH and LH in males?
FSH stimulates testosterone production; LH stimulates sperm production
FSH stimulates sperm production; LH stimulates testosterone production
Both FSH and LH stimulate estrogen production
Neither FSH nor LH affects male reproduction
Which hormone’s principal action includes promoting growth of body tissues via IGFs?
ACTH
TSH
GH
MSH
Which anterior pituitary hormone primarily promotes milk production by the mammary glands (together with other hormones)?
Adrenocorticotropic hormone (ACTH)
Prolactin (PRL)
Melanocyte-stimulating hormone (MSH)
Thyroid-stimulating hormone (TSH)
ACTH acts on which target tissue to stimulate secretion of glucocorticoids, mainly cortisol?
Thyroid gland
Adrenal cortex
Mammary glands
Pancreatic islets
Which statement best describes the principal action of melanocyte-stimulating hormone (MSH) in humans according to the summary?
It definitively controls blood glucose homeostasis.
Its exact role is unknown but it may influence brain activity; increased amounts can cause darkening of skin.
It directly stimulates cortisol release from the adrenal cortex.
It promotes milk production by mammary glands.
A patient has low cortisol levels due to decreased stimulation of the adrenal cortex. Which anterior pituitary hormone is most likely deficient?
Prolactin (PRL)
Adrenocorticotropic hormone (ACTH)
Melanocyte-stimulating hormone (MSH)
Growth hormone (GH)
Which pairing correctly matches hormone to its target tissue and principal action?
PRL → adrenal cortex → increases glucocorticoid secretion
MSH → mammary glands → promotes milk production
ACTH → adrenal cortex → stimulates secretion of glucocorticoids (mainly cortisol)
PRL → brain → influences brain activity
If MSH levels become elevated in a human, which observable effect is most consistent with the summary?
Pale skin with reduced pigmentation
Darkening of the skin
Increased milk production
Hyposecretion of glucocorticoids
Which stimulus directly triggers oxytocin release during childbirth?
Rising maternal blood glucose
Stretch placed on the cervix
Decreased fetal heart rate
Maternal dehydration
What is a primary effect of oxytocin on the uterus during labor?
Relaxes smooth muscle to reduce pain
Enhances contractions of uterine muscle
Initiates ovulation
Thickens the endometrium
Oxytocin’s role in lactation is best described as:
Stimulating milk production by alveolar cells
Inhibiting prolactin release
Stimulating milk ejection by the mammary glands in response to suckling
Increasing mammary blood glucose uptake
Which pair correctly matches the hormone with its main function in fluid balance?
Oxytocin — decreases urine output by acting on kidneys
ADH — regulates blood osmotic pressure by controlling water reabsorption
Oxytocin — increases blood osmotic pressure during dehydration
ADH — stimulates milk ejection during suckling
During dehydration, osmoreceptors detect increased blood osmotic pressure. Which hormonal response helps restore homeostasis?
Increased oxytocin leading to uterine contractions
Increased ADH promoting water reabsorption in kidneys
Decreased ADH increasing urine volume
Oxytocin causing milk ejection to conserve water
A mother is breastfeeding, and the infant’s suckling initiates a reflex. Which immediate hormonal effect supports feeding?
Oxytocin stimulates milk ejection
ADH increases urine output
Prolactin causes uterine contractions
ADH triggers milk production
Consider the following scenario: A patient has low blood volume and elevated plasma osmolarity. Which outcome would you predict if ADH secretion increases?
Urine output increases and osmotic pressure rises
Urine output decreases and blood osmotic pressure decreases
Milk ejection is stimulated and blood volume falls
Uterine contractions intensify and osmotic pressure increases
Which statement best integrates the roles of oxytocin and ADH in maintaining physiological stability?
Both hormones primarily regulate glucose homeostasis
Oxytocin supports reproductive events (labor and milk ejection), whereas ADH helps maintain water balance and blood osmotic pressure
Both hormones decrease urine output during childbirth
ADH stimulates uterine contractions while oxytocin regulates kidney water reabsorption
