Which of the following choices is used to initialize depolarization?

Which of the following is NOT a cause of varicose veins?

Which of the following is a faster rate of blood flow?

The cardiac centers of the autonomic nervous system are located in the:

Which of the following best represents the correct order in an impulse’s pathway through the conduction system of the heart?

Systole means ______________________.

The valve that prevents backflow from the left ventricle to the left atrium is the ___________________.

Which ion is involved in repolarization?

During the cardiac cycle, after the period of relaxation, which area contracts first?

Match the heart sound to the explanation.