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The thigh bone, longest and strongest bone in the body.

Stores and concentrates bile, releasing it into the small intestine to aid digestion.

Cell that transmits nerve impulses; fundamental unit of the nervous system.

Cells of the immune system, involved in defending the body against both infectious disease and foreign invaders.

Opening in the center of the iris that allows light to enter the eye.

Outermost layer of skin, providing a waterproof barrier and creating skin tone.

Hard surface in the mouth of ruminants that along with the lower incisors aids in the grinding of plant material.

Outer layer of the kidney responsible for filtering blood and forming urine.

Bone of the upper arm or forelimb, forms joints with the shoulder and elbow.

Produces digestive enzymes and hormones such as insulin and glucagon.

Chamber of heart responsible for pumping deoxygenated blood to the lungs.

Spiral-shaped, fluid-filled inner ear structure; it transforms sound into nerve impulses.

Male reproductive organs that produce sperm and testosterone.

Small, tube-like sac attached to the lower end of the large intestine; may play a role in the immune system.

Carries deoxygenated blood from the right ventricle to the lungs for oxygenation.

Tiny air sacs in the lungs where gas exchange occurs.

Muscular tube connecting the throat to the stomach, conducts food and liquids.

Calf muscle that flexes the knee and foot, important for walking, running, and jumping.

Lower jawbone, the only movable bone of the skull, holds the lower teeth.

Glands located above the kidneys that produce hormones like adrenaline and cortisol.

Chamber of heart responsible for pumping oxygenated blood to the body.

Largest vein in the body, carries deoxygenated blood to the heart.

Major air passages of the lungs that diverge from the windpipe.

Bean-shaped organ that filters waste products from the blood and excretes them in urine.

Muscular tissue of the heart, responsible for the pumping action of the heart.

Produces hormones that regulate the body's metabolic rate and calcium levels.

Small bean-shaped structures that are part of the lymphatic system and filter harmful substances from the lymph.

Inner layer of the kidney that forms the urine-concentrating mechanism.

Muscle of the upper arm that flexes the elbow and rotates the forearm.

Voice box, responsible for sound production and protecting the trachea against food aspiration.

Muscle that separates the thoracic and abdominal cavities and is crucial for respiration.

Part of the lymphatic system, located in the throat; they help fight off infection by trapping pathogens.

The largest stomach compartment in ruminants, involved in microbial fermentation.

Digestive organ where most chemical digestion and nutrient absorption occurs.

Large organ that processes nutrients, detoxifies, and produces bile.

Windpipe, conducts air to and from the lungs.

Cells responsible for carrying oxygen throughout the body.

Located in the brain, responsible for complex behaviors, learning, and memory.

Located in the brain, responsible for coordination and balance.

Located in the brainstem, responsible for autonomic control of heart rate and breathing.

Shoulder blade, provides attachment for several shoulder muscles.

The longest muscle in the body, it flexes, abducts, and laterally rotates the thigh.

A hard surface in the mouth of certain animals, like cows, that aids in grinding plant-based food.

Part of the brain responsible for hormone production and regulating body temperature, hunger, moods, and the circadian rhythm.

Colored part of the eye, regulates the amount of light that enters the eye by changing the size of the pupil.

Main artery carrying blood from the left ventricle of the heart to the rest of the body.

Absorbs water and forms feces, includes the colon and rectum.

Organ involved in the production and removal of blood cells and forming part of the immune system.

Master gland of the endocrine system, secretes hormones that regulate growth and other glands.

Layer at the back of the eyeball that contains cells sensitive to light and triggers nerve impulses to the brain.

Female reproductive organs that produce eggs and hormones like estrogen and progesterone.