Respiratory
Digestive
Cardiovascular
Skeletal-Muscular
Nervous
100

This organ helps you breathe in oxygen and breathe out carbon dioxide.

What are the lungs?

100

This is where digestion begins when you chew your food.

What is the mouth?

100

This organ pumps blood through your body.

What is the heart?

100

These hard parts give your body shape and protect organs.

What are bones?

100

This organ controls everything you do, including thinking and moving.

What is the brain?

200

This tube carries air from your throat to your lungs.

What is the trachea (windpipe)?

200

This organ mixes food with acid to break it down.

What is the stomach?

200

This red liquid carries oxygen and nutrients in your body.

What is blood?

200

This is the place where two bones meet.

What is a joint?

200

These carry messages between your brain and body.

What are nerves?

300

This muscle helps you breathe by moving up and down under your lungs.

What is diaphragm?

300

This long tube carries food from your mouth to your stomach.

What is the esophagus?

300

These vessels carry blood away from the heart.

What are arteries?

300

These muscles work without you thinking, like your heart.

What are involuntary muscles?

300

This part of the nervous system runs down your back and carries messages.

What is your spinal cord?

400

This part of your respiratory system filters, warms, and moistens the air you breathe in through your nose.

What is your nasal cavity?

400

This organ absorbs nutrients from digested food.

What is the small intestine?

400

These vessels return blood to the heart.

What are veins?

400

These muscles are attached to your bones and help you move.

What are skeletal muscles?

400

This is the largest part of your brain, responsible for thinking and memory.

What is the frontal lobe?

500

These tiny air sacs in the lungs exchange oxygen and carbon dioxide.

What are alveoli?

500

This organ removes water from waste before it leaves your body.

What is the large intestine?

500

These tiny blood vessels connect arteries and veins.

What are capillaries?

500

This type of muscle makes up the walls of your heart.

What is the cardiac muscle?

500

This is the system that controls your senses, thoughts, and movements.

What is the nervous system?