Identify the incorrect information.

Options

A. Stroke volume = 70 mI
B. Duration of cardiac cycle = 0.8 seconds
C. Cardiac output = 5 lit /sec
D. Heart rate = 72 beats /min.

Answer

To solve the question of identifying the incorrect information from the provided options, we can follow these steps:

### Step-by-Step Solution:

1. **Understand Stroke Volume**:
- Stroke volume is defined as the amount of blood ejected by the heart (specifically each ventricle) during one contraction.
- The given value is 70 ml, which is a standard value for stroke volume.
- **Conclusion**: This statement is correct.

2. **Evaluate Cardiac Cycle Duration**:
- The cardiac cycle refers to the complete sequence of events in one heartbeat, including contraction and relaxation phases.
- The typical duration of a cardiac cycle is approximately 0.8 seconds.
- **Conclusion**: This statement is correct.

3. **Calculate Cardiac Output**:
- Cardiac output (CO) is calculated using the formula:
\[ \text{Cardiac Output} = \text{Stroke Volume} \times \text{Heart Rate} \]
- Given stroke volume is 70 ml (0.07 liters) and heart rate is 72 beats per minute:
\[ \text{Cardiac Output} = 0.07 \, \text{liters} \times 72 \, \text{beats/min} = 5.04 \, \text{liters/min} \]
- The provided option states cardiac output is 5 liters per second, which is incorrect as it should be in liters per minute.
- **Conclusion**: This statement is incorrect.

4. **Assess Heart Rate**:
- The heart rate is given as 72 beats per minute, which is a normal resting heart rate.
- **Conclusion**: This statement is correct.

### Final Conclusion:
The incorrect information is found in **Option C**, which states that cardiac output is equal to 5 liters per second. The correct unit for cardiac output should be liters per minute, and the calculated value is approximately 5.04 liters per minute.

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