Human Anatomy and Physiology : Help with Inspiration and Expiration Physiology
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Example Question #11 : Respiratory Physiology
A man who suffers from complete paralysis of his intercostal muscles would still have a normal value for his __________.
None of the volumes listed
total lung capacity (TLC)
expiratory reserve volume (ERV)
inspiratory reserve volume (IRV)
vital capacity (VC)
None of the volumes listed
None of the volumes listed would be normal. The internal intercostal muscles contribute to forced expiration and would affect ERV, TLC and VC. The external intercostal muscles contribute to inspiration and would affect the IRV, TLC and VC. Thus, none of the above volumes could be normal in a man who has non-functioning intercostal muscles.
Example Question #12 : Respiratory Physiology
When exercising, the muscles of inspiration include __________.
transversus abdominis, rectus abdominis, external intercostals
external intercostals, scalene muscles, sternocleidomastoids
internal and external obliques
internal intercostals only
rectus abdominis, external intercostals, internal intercostals
external intercostals, scalene muscles, sternocleidomastoids
When exercising, the muscles of inspiration include: external intercostals, scalene muscles, sternocleidomastoids.
When exercising, the muscles of expiration include: rectus abdominis, internal and external obliques, transversus abdominis, internal intercostals.
Example Question #13 : Respiratory Physiology
During quiet breathing, which of the following is the main inspiratory muscle operating?
diaphraghm
internal intercostals
accessory muscles
abdominal wall muscles
external intercostals
diaphraghm
The main inspiratory muscle involved in quiet breathing is the diaphragm, which is a dome shaped sheet of skeletal muscle that is attached to the ribs, sternum, and vertebral column. External intercostals are also involved in quiet breathing, but if these muscles were impaired, quiet breathing would still continue because the diaphragm is the main muscle involved. Accessory muscles are not involved in quiet breathing, but may become involved during exercise. The abdominal wall muscles and internal muscles are both involved in expiration.
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