Beta blockers are a class of drug frequently prescribed as a treatment for hyper

Question

Beta blockers are a class of drug frequently prescribed as a treatment for hypertension (high blood pressure). Their effect is to slow the rate of the heart and decrease the force with which it beats, therefore decreasing cardiac output. Patients taking beta blockers can generally carry out day-to-day activities without difficulty. Assuming a decrease in heart rate and stroke volume (compared to the pre-beta blocker state) for a given level of baseline activity, how do the tissues receive adequate oxygen?

Beta blockers are a class of drug frequently prescribed as a treatment for hypertension (high blood pressure). Their effect is to slow the rate of the heart and decrease the force with which it beats, therefore decreasing cardiac output. Patients taking beta blockers can generally carry out day-to-day activities without difficulty. Assuming a decrease in heart rate and stroke volume (compared to the pre-beta blocker state) for a given level of baseline activity, how do the tissues receive adequate oxygen? Select the most reasonable answer. O The tissues use anaerobic metabolism to supply their energetic demands in excess of aerobic capacity The tissues can decrease their oxygen demand to compensate for the decreased cardiac output O Tissues that previously received too much oxygen now receive the appropriate amount. O The patient can increase ventilation to compensate for decreased cardiac output. O The tissues can extract more oxygen from the blood each time it circulates O Oxygen delivery occurs independently of cardiac output

Explanation / Answer

2nd option is most resonable. The tissue can decrease their oxygen demand to compensate for the decrease cardiac output. For example most common side effect shown by beta blockers are cold hands and feet and fatigue, this occur due to the response of tissue by which they decrease their demand of oxygen supply to compensiate the slow heart rate.

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