Veins carry what type of blood back to the heart so the cycle can repeat?

When all four heart valves are operating correctly, the valves should open and close completely once each ____________.

Which of the following decreases blood flow and heart rate?

What type of circulation is blood flow to the entire body except the lungs?

Which of the following would be a primary source of potassium?

Normal breathing is approximately how many respirations per minute in an adult?

A normal healthy pulse pressure should be in the range of  __________.

The largest part of the human heart is composed of four hollow cavities referred to as the _______________________.

What artery carries deoxygenated blood to the lungs from the right ventricle?

Where is calcium stored in the body?