What is the term for the amount of blood ejected from the heart in a single contraction?

The correct term for the amount of blood ejected from the heart in a single contraction is stroke volume. Stroke volume represents the volume of blood pumped from the left ventricle of the heart with each heartbeat. It is a key measure in understanding cardiac function and influences cardiac output, which is the total volume of blood the heart pumps per minute.

In the context of the other terms: cardiac output refers to the total volume of blood the heart pumps in one minute, which is the product of heart rate and stroke volume. Therefore, stroke volume and heart rate together determine cardiac output. Heart rate, on the other hand, indicates how many times the heart beats per minute, not the volume of blood moved per beat. Blood volume refers to the total amount of blood circulating in the body and does not specify the volume ejected per contraction. The definition and importance of stroke volume help clarify its role in assessing heart performance under various physiological conditions.