1. Circulatory system Quiz
The Heart

2. 1. Why does the left ventricle have such a thick muscle wall. 2
1. Why does the left ventricle have such a thick muscle wall? 2. Which blood vessel brings blood from the body into the heart? 3. Which blood vessel brings blood from the lungs into the heart? 4. Is blood in the right ventricle oxygen-rich or oxygen-poor? 5. Is blood in the pulmonary artery oxygen-rich or oxygen-poor?

3. 6. Where does blood in the aorta go to. 7
6. Where does blood in the aorta go to? 7. Why are there valves in the heart? 8. Name the four chambers of the heart. 9. Which blood vessel brings oxygen-rich blood into the heart? 10. Does blood in the left atrium and left ventricle have oxygen or not?