Endocrine- Renal- Urinary System Quiz

Which of the following correctly describes the sequence of hormone release in the hypothalamic-pituitary-adrenal (HPA) axis during a stress response?

• Pituitary gland releases ACTH → Hypothalamus releases CRH → Adrenal gland releases cortisol

• Hypothalamus releases CRH → Pituitary gland releases ACTH → Adrenal gland releases cortisol

• Adrenal gland releases cortisol → Pituitary gland releases ACTH → Hypothalamus releases CRH

• Hypothalamus releases ACTH → Pituitary gland releases CRH → Adrenal gland releases cortisol

Which hormone is produced by the adrenal cortex and is primarily responsible for regulating sodium and potassium levels in the body?

• Adrenaline (epinephrine)

• Aldosterone

• Noradrenaline (norepinephrine)

• Insulin

What is the main difference between the hormones secreted by the adrenal medulla and those secreted by the adrenal cortex?

• The adrenal medulla secretes steroid hormones, while the cortex secretes catecholamines.

• The adrenal cortex secretes peptide hormones, while the medulla secretes steroid hormones.

• The adrenal medulla secretes catecholamines for rapid stress response, while the cortex secretes steroid hormones for long-term regulation of metabolism and electrolytes.

• The adrenal cortex and medulla secrete the same hormones but in different amounts.

Which statement accurately describes the synthesis and action of norepinephrine and epinephrine?

• Both are steroid hormones produced in the adrenal cortex and act by changing gene expression inside the cell nucleus.

• Both are peptide hormones released by the pancreas and increase blood glucose by promoting glycogen breakdown.

• Both are catecholamines produced in the adrenal medulla, released in response to sympathetic nerve stimulation, and act quickly to prepare the body for 'fight or flight' by binding to cell surface receptors.

• Both are steroid hormones synthesized from cholesterol, secreted by the adrenal medulla, and increase sodium reabsorption in the kidneys.

What is the mechanism of action of cortisol and aldosterone?

• Both are peptide hormones that bind to cell surface receptors and activate second messenger systems.

• Both are steroid hormones derived from cholesterol, diffuse into cells, bind intracellular receptors, and alter gene expression to regulate metabolism (cortisol) or electrolyte balance (aldosterone).

• Both are catecholamines that increase heart rate and blood glucose by binding to adrenergic receptors.

• Both are hormones produced by the pancreas to regulate blood glucose.

A dog presents with excessive drinking, frequent urination, weight loss, and a dull coat. These signs are most consistent with which pancreatic disorder, and how does it relate to normal pancreatic function?

• Cushing's disease; excess cortisol increases glucose uptake

• Diabetes mellitus; lack of insulin disrupts normal blood glucose regulation

• Addison's disease; insufficient cortisol causes hypoglycemia

• Hyperaldosteronism; excess aldosterone increases potassium loss

A dog is diagnosed with Addison's disease and shows signs of lethargy, weakness, and low blood sugar. These symptoms most directly reflect disruption of which adrenal hormone's normal action?

• Cortisol, which normally helps mobilize energy and maintain blood sugar

• Epinephrine, which increases heart rate and blood sugar

• Aldosterone, which regulates sodium and water retention

• Insulin, which lowers blood glucose after a meal

What is the correct description of hormones and how they are categorized?

• Hormones are electrical signals that travel via nerves; they are classified as proteins, lipids, and nucleic acids.

• Hormones are chemical messengers produced by glands, classified as peptides/proteins, steroids, and amino acid derivatives.

• Hormones are digestive enzymes secreted into the gut, classified as carbohydrates, lipids, and proteins.

• Hormones are physical barriers in the body, classified as epithelial, connective, and nervous tissues.

How is the pituitary gland situated in the body, and how is it structurally divided?

• It is located in the abdomen and divided into cortex and medulla.

• It sits beneath the hypothalamus at the base of the brain and is divided into anterior (glandular) and posterior (neural) lobes.

• It is found in the chest and is divided into left and right lobes.

• It is located in the kidney and divided into cortex and pelvis.

Which are the main hormones produced by the anterior and posterior pituitary glands and their associated target organs?

• The anterior pituitary produces oxytocin and ADH, targeting the kidneys and uterus.

• The anterior pituitary produces FSH, LH, GH, TSH, ACTH, and prolactin, targeting organs like the gonads, thyroid, adrenal cortex, liver, and mammary glands; the posterior pituitary releases oxytocin and ADH, targeting the uterus, mammary glands, and kidneys.

• The posterior pituitary produces TSH and ACTH, targeting the thyroid and adrenal cortex.

• Both anterior and posterior pituitary produce insulin and glucagon, targeting the liver and pancreas.