This organ takes carbon dioxide out of the blood and puts oxygen into the blood.

This organ filters waste out of the blood and produces urine.

This organ is part of the central nervous system.

What is the main function of the digestive system?

These structures in the heart and blood vessels keep blood moving in only 1 direction.

Which of these cells is a nerve cell?

What nutrient does bile help break down?

Which blood vessels move blood away from the heart?

These thin blood vessels connect arties and veins.

These air sacs in the lungs are the site of gas exchange.

The heart has this number of chambers.

In which digestive organ are most of the nutrients absorbed into the blood stream?

Which organ produces bile?

Which is the only type of muscle that is considered to be voluntary?

The tube that brings air into the lungs is called the ____

Which of these causes you to breathe in?

This digestive organ absorbs water into the bloodstream.

These blood cells carries oxygen.

This is the liquid portion of the blood.

These cells help blood clot.

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