During vigorous exercise, increased O_2 is consumed and increased CO_2 is produc

Question

During vigorous exercise, increased O_2 is consumed and increased CO_2 is produced in the muscles. In addition, the temperature of the muscles increases. Exercise will result in (A) a higher partial pressure of O_2 in the muscles than at rest (B) hemoglobin unloads its oxygen more readily than at rest (C) a lower partial pressure of CO_2 in the muscles than at rest D) a higher blood pH than at rest (E) a loss in the ability to thermo-regulate. The velocity of blood flow is the lowest in capillaries because (A) the total cross-sectional area of the capillaries is greater than the total cross-sectional area of the arteries or any other part of the circulatory system. (B) the capillaries are far from the heart, and blood flow slows as distance from the heart increases. (C) the capillary walls are not thin enough to allow oxygen to exchange with the cells. (D) The diastolic blood pressure is too low to deliver blood to the capillaries at a high flow rate. (E) The systemic capillaries are supplied by the left ventricle, which has a lower cardiac output than the right ventricle.

Explanation / Answer

46.

B. Hemoglobin unload its oxygen more readily than at rest – The reason is the oxygen is required by the cells to convert fats and sugars into energy, that usually takes place during exercise.

47.

D. diastolic blood pressure too low to deliver blood to capillaries at a high flow rate. Pressure drops gradually as blood flows from the major arteries, through the arterioles, and the capillaries.

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