Which of the following statements about the structure and function of the human heart is correct?
Relaxation of the heart muscle is known as diastole.
Oxygenated blood enters the right side of the heart via the vena cava.
The walls of the atria are thicker than the walls of the ventricles because they pump blood under higher pressure.
Oxygenated blood is pumped to the body from the right ventricle.
