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During expiration, the diaphragm :...

During expiration, the diaphragm :

A

i) Expands

B

ii) Relaxes

C

iii) Contracts

D

iv) Folds

Text Solution

AI Generated Solution

The correct Answer is:
**Step-by-Step Solution:** 1. **Understanding Expiration**: Expiration, also known as exhalation, is the process of breathing out air from the lungs. It is essential to know what happens to the diaphragm during this process. 2. **Role of the Diaphragm**: The diaphragm is a dome-shaped muscle located at the base of the thoracic cavity. It plays a crucial role in the breathing process by contracting and relaxing. 3. **Muscle Action During Expiration**: During expiration, the diaphragm does not expand; instead, it relaxes. When the diaphragm relaxes, it moves upwards into the thoracic cavity. 4. **Effect of Diaphragm Relaxation**: As the diaphragm relaxes and moves upwards, the volume of the thoracic cavity decreases, which increases the pressure in the lungs. This pressure change causes air to be pushed out of the lungs. 5. **Conclusion**: Therefore, during expiration, the diaphragm relaxes, allowing the lungs to deflate and air to be expelled from the body. **Final Answer**: The correct option is that during expiration, the diaphragm **relaxes**. ---
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