Which term refers to the amount of blood ejected from the heart with each contraction?

The term that refers to the amount of blood ejected from the heart with each contraction is stroke volume. Stroke volume is a key indicator of the heart's efficiency and function, specifically reflecting how much blood the left ventricle pumps into the aorta during one heartbeat.

Understanding stroke volume is crucial for evaluating an individual's cardiovascular health, as it helps to determine how well the heart performs under different conditions, such as during rest or exercise. It is typically measured in milliliters and is influenced by factors such as heart size, muscle strength, and overall fitness levels.

In contrast, cardiac output is the product of stroke volume and heart rate, representing the total volume of blood the heart pumps per minute, rather than per contraction. Venous return pertains to the flow of blood back to the heart and does not specifically measure the output of blood with each heartbeat. Blood pressure refers to the force exerted by circulating blood on the walls of blood vessels, which is a different measurement altogether. Thus, stroke volume specifically addresses the quantity of blood delivered from the heart during each contraction.