During cardiac cycle each ventricle pumps out about 70 ml of blood which is called

Options

A. Stroke volume
B. Cardiac output
C. Tidal volume
D. Residual volume

Answer

**Step-by-Step Solution:**

1. **Understanding the Cardiac Cycle**: The cardiac cycle refers to the sequence of events in one heartbeat, including the contraction and relaxation of the heart chambers. Each ventricle pumps blood during this cycle.

2. **Identifying the Volume of Blood Pumped**: During each cardiac cycle, each ventricle pumps out approximately 70 ml of blood. This specific volume is crucial for understanding heart function.

3. **Defining Stroke Volume**: The volume of blood that is ejected from each ventricle during the cardiac cycle is known as the stroke volume. Therefore, the 70 ml of blood pumped out by each ventricle corresponds to the stroke volume.

4. **Explaining Other Options**:
- **Cardiac Output**: This is the total volume of blood pumped by the heart per minute and is calculated by multiplying the stroke volume by the heart rate (number of beats per minute).
- **Tidal Volume**: This term refers to the amount of air inhaled or exhaled during normal breathing, which is unrelated to blood volume.
- **Residual Volume**: This is the amount of air that remains in the lungs after a forceful exhalation, also unrelated to blood volume.

5. **Conclusion**: Based on the definitions and explanations provided, the correct answer to the question is that the volume of blood pumped out by each ventricle during the cardiac cycle is called the stroke volume.

**Final Answer**: Stroke Volume

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