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Internal intercostal muscles are expirat...

Internal intercostal muscles are expiratory/inspiratory muscles.

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**Step-by-Step Solution:** 1. **Identify the Internal Intercostal Muscles:** - The internal intercostal muscles are a group of skeletal muscles located between the ribs. There are 11 pairs of these muscles on either side of the rib cage. 2. **Understand the Function of Internal Intercostal Muscles:** - The primary function of the internal intercostal muscles is to depress the ribs. When these muscles contract, they pull the ribs downward and inward. ...
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