The apical heartbeat in an adult is best heard at the level of the _____.

The left ventricular wall is thicker than the right ventricular wall in order to

During atrial systole

The pressoreceptors located in the _____ respond to stretching by slower the rate of the heart.

About _____% of the atrial blood flows into the ventricles before the atria contract.

The first heart sound results when the _____.

The _____ layer of an artery contains the greatest amount of smooth muscle.

A stethoscope placed at the tip of the sternum will best be able to detect which sound?

The membrane closest to the heart muscle is the _____.

Blood from the cardiac muscle itself drains into the _____.

The foramen ovale

The "DUP" sound of the heart is due to

Mitral valve prolapse is a condition, which causes blood to back flow into the _____.

The blood vessels that play the most important role in the regulation of blood flow to a tissue and blood pressure are the