If the heartbeat of a person is about 75 beats per minute, and stroke volume is 70 mL per minute, then the cardiac output will be

Options

A. 5000 mL
B. 5250 mL
C. 5500 mL
D. 5150 mL

Answer

To calculate the cardiac output based on the given information, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definitions**:
- **Heart Rate (HR)**: The number of beats per minute. In this case, it is given as 75 beats per minute.
- **Stroke Volume (SV)**: The amount of blood pumped by the heart with each beat. Here, it is given as 70 mL per beat.

2. **Formula for Cardiac Output (CO)**:
- The formula to calculate cardiac output is:
\[ \text{Cardiac Output (CO)} = \text{Heart Rate (HR)} \times \text{Stroke Volume (SV)} \]

3. **Substitute the Values**:
- Now, substitute the values into the formula:
\[ \text{CO} = 75 \, \text{beats/min} \times 70 \, \text{mL/beat} \]

4. **Perform the Calculation**:
- Multiply the heart rate by the stroke volume:
\[ \text{CO} = 75 \times 70 = 5250 \, \text{mL/min} \]

5. **Convert to Liters (if necessary)**:
- Since 1000 mL = 1 L, we can also express this in liters:
\[ \text{CO} = 5.25 \, \text{L/min} \]

6. **Final Answer**:
- The cardiac output is 5250 mL/min or 5.25 L/min.

### Conclusion:
The correct answer for the cardiac output based on the given values is **5250 mL/min**.