Volume of air inspired and expired in each breath in normal respiration by man is called

Options

A. Tidal volume
B. Total lungs capacity
C. Inspiratory capacity
D. Residual volume

Answer

To answer the question regarding the volume of air inspired and expired in each breath during normal respiration by humans, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding the Question**: The question asks for the specific term that describes the volume of air that is inhaled and exhaled in a single breath during normal breathing.

2. **Identifying the Options**: The options provided are:
- A) Tidal Volume
- B) Total Lung Capacity
- C) Vital Capacity
- D) Residual Volume

3. **Analyzing the Options**:
- **Tidal Volume**: This is the correct term. It refers to the amount of air that is inhaled or exhaled during normal respiration. Typically, it is about 500 ml in a healthy adult.
- **Total Lung Capacity**: This is the maximum amount of air that the lungs can hold after a deep inhalation. This is not the correct answer as it does not refer to a single breath.
- **Vital Capacity**: This refers to the maximum amount of air that can be exhaled after a maximum inhalation. It is also not the correct answer as it encompasses more than just a single breath.
- **Residual Volume**: This is the amount of air that remains in the lungs after a full exhalation. This is not the correct answer as it does not pertain to the volume of air exchanged in a normal breath.

4. **Conclusion**: After analyzing the definitions of the terms, we can conclude that the correct answer to the question is **A) Tidal Volume**.

### Final Answer:
The volume of air inspired and expired in each breath in normal respiration by man is called **Tidal Volume**.

---