1Where is the heart situated, and how is it protected?
2Why is the wall of the left ventricle thicker than the wall of the right ventricle?
3Name the four chambers of the heart. How does the work of the auricles differ from that of the ventricles?
4What is the function of the septum in the heart?
5Name the four valves of the heart and state where each is situated.
6Describe, in order, how impure blood returning from the body passes through the heart and lungs and goes back to the body.
7Why are the pulmonary artery and the pulmonary vein called exceptions?
8How does the heart muscle itself get oxygen?
9Why must the tricuspid and bicuspid valves close when the ventricles contract?