Which muscle(s) primarily work(s) during forced expiration?
Understand the Problem
The question is asking about the muscles involved in forced expiration, specifically which ones play the primary role during this process. We need to identify and understand the function of each muscle listed in the options provided.
Answer
Abdominal muscles and internal intercostals.
During forced expiration, the primary muscles involved are the abdominal muscles, which include the obliques, as well as the internal intercostals.
Answer for screen readers
During forced expiration, the primary muscles involved are the abdominal muscles, which include the obliques, as well as the internal intercostals.
More Information
During forced expiration, additional help comes from the internal intercostal muscles, which aid in pulling the ribs downward and inward, while the abdominal muscles push against the diaphragm to increase the pressure in the thoracic cavity.
Tips
A common mistake is to assume the diaphragm is involved in forced expiration, but it is primarily active during inspiration.
Sources
- Muscles of Respiration - Physiopedia - physio-pedia.com
- Muscles of respiration - Wikipedia - sciencedirect.com
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