PHYSIOLOGY
CARDIOVASCULAR PHYSIOLOGY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Which of the statements does NOT describe why atrial defect or dysfunction is only felt during exercise or when there is increased demand for oxygen.
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the blood from atrial contraction is needed
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the blood from ventricular filling is not available
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both
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None of the above
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Explanation:
Detailed explanation-1: -It looks at the role of adenosine triphosphate, or ATP, a chemical that can be released by red blood cells and is believed to cause blood vessels to dilate during exercise, when muscles demand more oxygen.
Detailed explanation-2: -Increased oxygen consumption in tissues leads to local vasodilation (i.e. metabolic autoregulation). This reduction in local vascular resistance causes an increase in local flow for the same MAP. In addition, there is a slight reduction in afterload, which increases stroke volume.
Detailed explanation-3: -The cardiac output increase is due to a large increase in heart rate and a small increase in stroke volume.
There is 1 question to complete.