Is increase muscle perfusion during exercise accomplished by: Muscular contracti

Question

Is increase muscle perfusion during exercise accomplished by: Muscular contraction compresses the blood vessels
Precapillary sphincter‘s concert in response to muscle metal blades such as laughing gas at CO2 and Adenosine
Is increase muscle perfusion during exercise accomplished by: Muscular contraction compresses the blood vessels
Precapillary sphincter‘s concert in response to muscle metal blades such as laughing gas at CO2 and Adenosine
Muscular contraction compresses the blood vessels
Precapillary sphincter‘s concert in response to muscle metal blades such as laughing gas at CO2 and Adenosine

Explanation / Answer

Muscle perfusion during exercise increases dramatically. Perfusion is increased by precapillary sphincters, which constrict in response to muscle metabolites such as lactic acid, CO2, and adenosine. During exercise demand of oxygen increases and muscle releases substance such as lactic acid and CO2. In response to vasodilator precapillary sphincter dilate to perfuse more blood and reduce oxygen demand and also increases the release epinephrine from adrenal medulla in response to sympathetic stimulus, which cause constriction in skin and viscera and at same time of dilation.

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