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Which scenario will cause pulmonary ventilation to rise?

A.

Increased surface tension

B.

Increased lung compliance

C.

Fewer alveolar sacs

D.

More airway resistance

Answer and Explanation

The Correct Answer is B

A. Increased surface tension: This would decrease ventilation as it increases the force needed to expand the lungs.

B. Increased lung compliance: Compliance refers to how easily the lungs can expand. Increased compliance makes it easier for the lungs to inflate, thereby increasing ventilation.

C. Fewer alveolar sacs: Having fewer alveolar sacs reduces the surface area for gas exchange, which would likely reduce ventilation efficiency.

D. More airway resistance: Increased airway resistance makes it harder to breathe, so it would reduce ventilation rather than increase it.


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Related Questions

Correct Answer is B

Explanation

A. Mouth: Digestion in the mouth is primarily due to amylase, which breaks down carbohydrates, not trypsin.

B. Stomach: Trypsin is produced as trypsinogen in the pancreas and is activated in the small intestine. While trypsin is crucial for digestion, it is important in the small intestine.

C. Large intestine: The large intestine is mainly involved in water absorption, not digestion by enzymes like trypsin.

D. Oesophagus: The esophagus transports food but does not produce enzymes like trypsin.

Correct Answer is C

Explanation

A. Expiratory reserve volume: This is included in the calculation of vital capacity (VC = TV + IRV + ERV).

B. Tidal volume: This is also included in vital capacity.

C. Residual volume: The residual volume is the air that remains in the lungs after a forced exhalation and is not part of the vital capacity.

D. Inspiratory reserve volume: This is included in the calculation of vital capacity.

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