What term describes the amount of blood ejected from the heart during one contraction?

The term that describes the amount of blood ejected from the heart during one contraction is referred to as stroke volume. It specifically measures the volume of blood pumped by the left ventricle with each heartbeat, which is crucial for understanding the heart's efficiency and overall cardiovascular function.

Stroke volume is an important parameter because it directly affects cardiac output, which is the total volume of blood the heart pumps per minute. While cardiac output is calculated by multiplying stroke volume by heart rate, stroke volume itself is solely concerned with the blood volume per individual heartbeat. This distinction makes it vital for assessing patient conditions and understanding fluid dynamics within the cardiovascular system.

Heart rate, on the other hand, is simply the number of beats per minute and does not directly measure the volume of blood ejected. Blood pressure refers to the force exerted by circulating blood upon the walls of blood vessels, not the volume of blood being pumped by the heart.