The functional unit of the muscle cell is the

Thick filament of protein with heads found in skeletal muscle cells

Neurotransmitter that transmits an impulse in a muscle cell

Three types of muscle tissue

Tough connective tissue that connects skeletal muscles to bones

Involuntary waves of muscle contraction that keep food moving along in one direction through the digestive system.

A protein that covers myosin binding sites on the actin molecules

The system where the thick myosin and thin actin filaments slide past each other so that their degree of overlap increases to create a muscle contraction

Proteins anchoring thin filaments of adjacent sarcomeres

Oxygen storing protein in blood within the red muscle

Long slender skeletal muscle cells; myocytes

Secrete substances within the body for the purpose of maintaining homeostasis

Chemical transmitters that regulate body functions

Situated inside center of brain, below thalamus; connection between endocrine and nervous systems

Responsible for increasing water absorption in the blood by the kidneys to adjust urine concentration

Cuddle hormone, also produces uterus contraction during labor

Located near base of brain; called the "master gland". Regulates all the other endocrine glands; consists of anterior and posterior lobe

Growth and development of bones, muscles, and other organs in children

Controls growth and development of thyroid gland; stimulates production of thyroid hormones

Stimulates growth of ovarian follicles and eggs in females and production of sperm in males

Located in brain and secretes melatonin and regulates sleep cycle

Released by the adrenal glands; stimulates the sympathetic nervous system and increases the heart rate; increases blood pressure.

Made in the parathyroid glands, works with calcitonin and increases blood calcium and decreases blood phosphate

Released by the pancreas, regulates the transport of glucose to the cells; increases metabolism of carbohydrates; decreases blood sugar

From ovaries, promotes secondary sexual characteristics and regulates the menstrual cycle

Produced by testes, promotes secondary sexual characteristics and functions in males

Liquid in the body that carries oxygen, carbon dioxide, and helps heal cell tissue

Oxygen carrying pigment in red blood cells

Blood cells that fight disease

These help to clot blood

A hereditary disease where blood does not clot or coagulate to stop bleeding

Small oval clumps of lymphatic tissue located at grouped intervals along lymphatic vessels

Watery fluid containing specialized white blood cells

A type of white blood cell that make antibodies to fight off infections

Organ of lymphatic system that filters blood

Puffy swelling of tissue from the accumulation of lymph fluid

Lack of a normal number of red blood cells and iron

Cancer of white blood cells

Lump of blood; dangerous if it blocks a blood vessel

Virus that destroys the immune system that should protect the body from diseases.

Liquid part of blood, contains nutrients and water

Organs that work together to produce offspring

The period of sexual maturation, during which a person becomes capable of reproducing

A mature egg cell

Female reproductive organ in which eggs mature and produces estrogen

The organ in which the baby develops and is protected until birth

The organ which connects the ovary to the uterus

The organ which produces sperm and testosterone

A long coiled tube in which sperm mature

The release of the ovum from the ovary

A series of monthly changes in the female reproductive system

The lining of the uterus which allows an egg to implant

Cessation of menstruation, typically in older women

Fertilized egg

The organ which connects a mother to a fetal umbilical cord

The developing human organism from 9 weeks after conception to birth

Brings deoxygenated blood from the lower portion of the body and into the right ventricle

These carry oxygenated blood to the body away from the heart

A four chambered pump composed of two atria and two ventricles

Very thin walled blood vessels that connect the arterioles and venules

Receives blood from the right ventricle and transports it to the lungs

Carry deoxygenated blood back to the heart

Receives blood from the left ventricle and transports it around the body.

The valve found between the right atrium and right ventricle. It has three cusps

These are found in veins to prevent the back flow of blood

Supply oxygenated blood to the muscle tissue of the heart

The hollow space behind the nose which filters, warms and humidifies the air we breathe.

The tube in the throat that connects the pharynx with the bronchi. It contains C-shaped rings of cartilage

The end of the tracheal tube which branches off to enter the right and left lung.

Tiny air sacs at the end of bronchioles where gas exchange takes place in the lungs.

The main organ of the respiratory system which gas exchange occurs.

The space in the human body where the heart and lungs are located.

A sheet of muscle that separates the thoracic cavity from the abdomen; also helps in breathing by expanding to increase pressure in the thoracic cavity

The process of taking in oxygen to our lungs.

The process of expelling carbon dioxide from our lungs.

In respiration, this process is how oxygen gets into the blood and from the blood into the cells.

Provides the area of gas exchange between the the environment and the blood for use by organ and muscle functions.

A flap of tissue that seals off the windpipe and prevents food from entering.

A condition in which the air sacs of the lungs are damaged and enlarged, causing breathlessness; usually a condition caused by smoking.

Inflammation of the bronchi causing excessive coughing and phlegm production.

Bone structure of the human body that protects our lungs and heart.

The system where food is broken down into a substance that the body can use.

Carries food to the stomach.

Produces a bile that is used to break down fat.

Where bile is stored before it's released into the small intestine

Where enzymes are made to break down carbohydrates and proteins in the small intestines and insulin is produced.

Where smooth muscles grind food into hydrochlohic acid and gastric juices

Where liquid food moves from the stomach, where the most chemical digestion occurs. Location for nutrient absorption into the bloodstream

The short tube at the end portion of the large intestine where solid waste is stored

The proteins that are used in chemical digestion.

The system that is meant to excrete liquid cellular waste

Where blood passes through to be cleaned out by nephrons.

Long tubes which urine passes through to enter the urinary bladder.

Ammonia is converted in the liver into this substance that gives urine its name

Where the extra water still trapped inside in extracted and the waste left is called feces.

Small finger-like structures that line the small intestines and increase surface area.