A healthy man of average fitness is undergoing an exercise physiology test. When

Question

A healthy man of average fitness is undergoing an exercise physiology test. When he is near his exercise limit, he begins to feel short of breath. What is happening in his tissues?

A. Tissues are anaerobically generating carbon dioxide because he is limited by his cardiovascular function.

B. Tissues are anaerobically generating carbon dioxide because he is limited by his pulmonary function.

C. Tissues are anaerobically generating lactic acid because he is limited by his cardiovascular function.

D. Tissues are anaerobically generating lactic acid because he is limited by his pulmonary function.

Explanation / Answer

Ans.

The choice is: (B).

More carbon dioxide and less oxygen during exercise is leading to shortness of breath. During exercise ventilation increases to meet the demands of more oxygen in the tissues and to remove excess carbon dioxide produced during exercise at the tissues. This is achieved by increasing the Tidal volume (amount of air inhaled and exhaled with every breath) and by increasing the respiration or breathing rate. In the lungs at alveoli gaseous exchange takes place where oxygen diffuses in the blood and is carried to the tissues and carbon dioxide from tissues diffuses out from blood to the atmosphere.

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