Which structures prevent heart valves from being forced backward into the wrong chamber?

The heart contains _____ which prevent the backflow of blood.

Which of the following best explains how a young, healthy individual could develop a serious heart condition?

Which chamber(s) of a human heart receive(s) and pump(s) oxygenated blood?

What is the physiological cause of a heart attack?

Blood leaves the inferior vena cava and flows directly into the __________.

Pressure is greatest in the ventricles when __________.

The SA node generates an electrical impulse from its location in __________.