KROK 1 2012 – Question 169 · KROK (Medicine) · Physiology
A doctor asked a patient to breathe out fully after taking a normal breath. What muscles contract during such exhalation?
- A. External intercostal muscles
- B. Trapezius muscles
- C. Abdominal muscles
- D. Diaphragm
- E. Pectoral muscles
Hint
Remember that quiet exhalation needs no muscle contraction; consider which muscles help to force the remaining air out and how they change the pressure acting on the lungs.
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