Amount of Blood ejected from the ventricles with each beat of the heart is called :

Question

Accepted Answer

The correct answer to the question "Amount of Blood ejected from the ventricles with each beat of the heart is called" is Option 4: Stroke volume.

1. **Explanation for Option 4 (Stroke Volume):**
   Stroke volume is the term used to describe the amount of blood ejected by the left ventricle of the heart during each contraction or heartbeat. It is a crucial component of cardiac output, which is the total volume of blood the heart pumps per minute. Stroke volume is influenced by several factors, including heart contractility, preload (the initial stretching of the cardiac myocytes prior to contraction), and afterload (the pressure the heart must work against to eject blood). Understanding stroke volume is essential for assessing cardiac function and overall cardiovascular health.

2. **Explanation for why other options are incorrect:**

- **Option 1 (Heart Rate):** Heart rate refers to the number of times the heart beats per minute. While heart rate is an important measure of cardiac activity, it does not describe the volume of blood ejected with each beat. Instead, it indicates how frequently the heart is beating.

- **Option 2 (E.C.G.):** E.C.G., or electrocardiogram, is a test that records the electrical activity of the heart over a period of time. It is used to detect heart abnormalities, monitor heart health, and diagnose various cardiac conditions. However, it does not measure the volume of blood ejected from the ventricles.

- **Option 3 (Cardiac Cycle):** The cardiac cycle refers to the sequence of events that occur in the heart during one complete heartbeat, including the contraction and relaxation of the atria and ventricles. While the cardiac cycle encompasses the process of blood ejection, it is not specifically the term used to describe the volume of blood ejected with each beat.

In summary, stroke volume is the precise term that describes the amount of blood ejected from the ventricles with each heartbeat, making Option 4 the correct answer.