Human Body Systems

Which blood vessel takes blood from cells back to the heart?

What waste do the lungs get rid of?

Which organs send chemicals to the small intestine to help digest food?

What is the strongest muscle in the body?

A small flap that covers the trachea so that food doesn't go into your lungs when you swallow.

To breathe out carbon dioxide

This is sometimes called the transportation system of the body

Around the wall of each air sac in the lungs is a web of

The skull protects the

The red blood cells carry it to all parts of the body.

Organs work together to become

Which one does not belong?

The outside covering of the body

These pull liquid waste from the blood

Which one does not belong?

This is stored in the bladder until it is passed out of the body.

The body must have

Which one is NOT part of the circulatory system? 

These line the walls of the small intestine and are surrounded by capillaries.

Tiny clusters of air sacs that are surrounded by capillaries.