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Which muscle contracts during normal exp...

Which muscle contracts during normal expiration?

A

Diaphragm

B

EICM

C

IICM

D

None of these

Text Solution

AI Generated Solution

The correct Answer is:
To determine which muscle contracts during normal expiration, we can analyze the process of breathing and the roles of different muscles involved. ### Step-by-Step Solution: 1. **Understanding Expiration**: - Expiration is the process of exhaling air from the lungs. It is generally a passive process during normal breathing. 2. **Muscles Involved in Breathing**: - The primary muscles involved in breathing are the diaphragm and the intercostal muscles. - The diaphragm contracts during inhalation (inspiration), while the intercostal muscles assist in both inhalation and exhalation. 3. **Normal Expiration**: - During normal expiration, the diaphragm relaxes, and the elastic recoil of the lungs helps push air out. - The intercostal muscles (specifically the internal intercostal muscles) may assist in forced expiration, but they are not primarily responsible for normal expiration. 4. **Analyzing the Options**: - **Diprogram**: This seems to be a misspelling of "diaphragm," which contracts during inhalation, not expiration. - **EICM (External Intercostal Muscles)**: These muscles assist in inhalation, not expiration. - **IICM (Internal Intercostal Muscles)**: These muscles can assist in forced expiration but are not primarily responsible for normal expiration. - **None of these**: This option suggests that none of the listed muscles are responsible for normal expiration. 5. **Conclusion**: - Since normal expiration is primarily a passive process that does not require the contraction of any specific muscle, the correct answer is "none of these." ### Final Answer: **None of these.**
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