Stroke Volume is the amount of blood pumped by the heart's left ventricle with each heartbeat. It is a crucial measure of heart function and is influenced by factors such as heart size, contractility, and the volume of blood returning to the heart. A higher Stroke Volume typically indicates a more efficient heart, as it can deliver more oxygen-rich blood to the body with each contraction. Conversely, a lower Stroke Volume may suggest heart problems or reduced physical fitness, making it an important metric in assessing cardiovascular health.