6.9 Which statement best describes that part of the breathing cycle called expir

Question

6.9 Which statement best describes that part of the breathing cycle called expiration? A. The diaphragm contracts B. The pressure within the lungs is less than the atmospheric pressure C. The volume of the lungs decreases D. The volume of the lungs expands 6.9 Which statement best describes that part of the breathing cycle called expiration? A. The diaphragm contracts B. The pressure within the lungs is less than the atmospheric pressure C. The volume of the lungs decreases D. The volume of the lungs expands 6.9 Which statement best describes that part of the breathing cycle called expiration? A. The diaphragm contracts B. The pressure within the lungs is less than the atmospheric pressure C. The volume of the lungs decreases D. The volume of the lungs expands

Explanation / Answer

expiration happens due to elastic propeties of the lungs
as the thoracic diaphragm relaxes during exhalation it causes the tissue it has depressed to rise superiorly and put pressure on the lungs to expel the air.
during expirtion volume of lungs decreses  

Answer : option C

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