Multiple Choice
When the volume of air in the lungs is the greatest:
22. The Respiratory System
Ventilation
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Which muscle is likely to be contracting while blowing up a balloon?
A
Rectus abdominis.
B
Sternocleidomastoid.
C
Diaphragm.
D
Scalenes.
Verified step by step guidance1
Identify the primary action involved in blowing up a balloon, which is forceful exhalation.
Consider the muscles involved in forceful exhalation. These muscles are responsible for decreasing the volume of the thoracic cavity to expel air.
The diaphragm is primarily involved in inhalation, so it is less active during forceful exhalation.
The rectus abdominis is a muscle of the abdominal wall that helps in forceful exhalation by pushing the diaphragm upwards.
The sternocleidomastoid and scalenes are accessory muscles of respiration, primarily aiding in inhalation, not exhalation. Therefore, the rectus abdominis is more likely to be contracting during the action of blowing up a balloon.
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