During exercise, which physiological change directly contributes to an increase in myocardial oxygen consumption? A) Increased heart rate B) Increased stroke volume C) Vasodilation... During exercise, which physiological change directly contributes to an increase in myocardial oxygen consumption? A) Increased heart rate B) Increased stroke volume C) Vasodilation of peripheral blood vessels D) Increased blood pressure
Understand the Problem
The question is asking about the physiological changes that occur during exercise and how they specifically relate to an increase in myocardial oxygen consumption. The options provided will help identify which change has a direct impact on the heart's oxygen needs during physical activity.
Answer
Increased heart rate.
The final answer is increased heart rate.
Answer for screen readers
The final answer is increased heart rate.
More Information
During exercise, increased heart rate significantly contributes to higher myocardial oxygen consumption as it raises both heart rate and contractility.
Tips
A common mistake is confusing mechanisms that increase blood flow to muscles with those specifically increasing myocardial oxygen consumption. Heart rate is more directly tied to myocardial demand.
Sources
- Physiology, Myocardial Oxygen Demand - StatPearls - NCBI Bookshelf - ncbi.nlm.nih.gov
- Heart Muscle Oxygen Consumption - an overview - ScienceDirect.com - sciencedirect.com
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