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Cardiovascular System
Nervous System
Skeletal System
Muscular System
Digestive System
100

The network of thin-walled blood vessels that connect the smallest arteries (arterioles) and the smallest veins (venules).

What are capillaries?

100
The four lobes of the brain.
What are the temporal lobe, the parietal lobe, the occipital lobe and the frontal lobe?
100

The soft, spongy tissue that fills the cavities of bones and produces the cellular components of blood.

What is bone marrow?

100

The four large muscles at the front of the thigh that are involved in movement.

What are the quadriceps?

100
The watery fluid that prepares food for swallowing and initiates the process of digestion.
What is saliva?
200

The largest artery in the body that supplies all parts of the body (except the lungs) with oxygenated blood.

What is the aorta?

200
The impulse-conducting cells of the brain, nervous system and spine.
What are neurons?
200
The number of bones that make up the adult skeletal system.
What is 206 bones?
200

A band of tough, fibrous tissue that connect muscles to bones.

What is a tendon?

200
The muscular tube that connects the mouth and throat to the stomach.
What is the esophagus?
300
The scientific name for a red blood cell.
What is an erythrocyte.
300
The weight of the human brain.
What is 3 pounds on average?
300

The longest bone in an adult human.

What is the femur?

300

Muscle tissue that moves without conscious control and is found in walls of internal organs, such as the bladder.

What are smooth muscles?

300
The liquid inside of the stomach that helps to break down food and kill existing bacteria inside food.
What are gastric juices?
400
The circulation of blood between the heart and lungs.
What is pulmonary circulation?
400
The arched bridge of nervous tissue that connects the brain's hemispheres.
What is the corpus callosum?
400

At birth, the approximate number of bones in the human body.

What is 300 bones?

400
The three types of muscle tissues that make up the muscular system.
What are the skeletal, smooth and cardiac?
400
The average length of the small intestine in an adult human male.
What is 22 feet?
500
The valve that regulates blood flow between the left atrium and the left ventricle within the heart.
What is the mitral valve?
500
The first language area within the left hemisphere to be discovered.
What is the Broca's area?
500

A disease in which bones lose an excessive amount of protein and minerals (such as calcium) and consequently lose bone mass.

What is osteoporosis?

500
An elongated contractile cell that is composed of myofibrils and forms the muscles of the body.
What is a muscle fiber?
500
A tubular projection attached to the large intestine that is located at the lower right side of the abdomen.
What is the appendix?