Brain & Central Nervous system
Circulatory
Respiratory
Skeletal
Muscular
100

You have many miles of these throughout your body that gather information for your brain to use.

What are nerves ?

100

The number of chambers, or special rooms, in the heart.

What is 4 ?

100

You have two of these organs which inflate and deflate with every breath.

What are the lungs?

100

This bone protects the heart.

What is the sternum?

100

The name for muscles that we can choose whether to move or not.

What is voluntary?

200

Your brain cells are very sensitive to this gas and without it, they will begin to die.

What is oxygen?

200

You have 60,000 miles of thee tubes to carry blood to and from all parts of your body.

What are the blood vessels (arteries/vein/capillaries is okay too) ? 

200

These tubes branch off from the trachea and lead into each lung.

What are the bronchi?

200

The knee, elbow, jaw, hips, and ankles are just a few examples of where these are located.

What are joints ? 

200

These kinds of muscles control the movement of organs and blood vessels.

What are smooth muscles?

300

This part of your brain attaches to the spinal cord and is responsible for keeping your heart beating and your lungs breathing.

What is the brain stem?

300

These blood vessels carry oxygen-rich blood from the heart to all part of the body.

What are arteries ? 

300

This strong muscle helps move air in and out of the lungs.

What is the diaphragm?

300

These strong bands of tissue connect bone to bone.

What are ligaments?

300

Muscles that function automatically, without our having to think about it, are called this.

What is involuntary?

400

This is the largest part of your brain, and it is responsible for your intelligence.

What is the cerebrum ?

400

These blood vessels carry blood back to the heart and lungs to receive oxygen.

What are veins ? 

400

Millions of these tiny air sacs are located inside the lungs. 

What are the alveoli?

400

This strong, flexible material covers the ends of your bones so that they can slip smoothly past one another.

What is cartilage? 

400

This is the approximate number of skeletal muscles in the human body.

What is 600?

500

This part of your brain is responsible for your coordination and balance. It is Latin for "little brain."

What is the cerebellum?

500

These very thin blood vessels in which the exchange of oxygen and food takes place.

What are capillaries?

500
This flap of tissue covers the trachea when you swallow so that food does not enter the lungs.

What is the epiglottis?

500

This jelly-like substance is found in the center of some long bones and helps make new red blood cells.

What is bone marrow? 

500

You were about this old in the womb when your cardiac muscle, or heart, started beating.

What is 1 month old or (about 30 days) ?