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4.2 Explain The Processes For Redistributing
Blood During Exercise
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This blog is looking at how blood redistributes during exercise, during exercise our blood flow increases due to the increase in the heart rate. When at rest the blood flow to our muscles is only around 20 -25% but during exercise that increases to around 80 - 85% (biosbcc.net). The increase in the blood flow to our skeletal muscles is iniciated by three things, an increase in our cardiac output, vasodilation of skeletal muscle arterioles and vasoconstriction of arterioles in the viscera and skin.
The increase in our cardiac output is caused by the sympathetic nervous system, the increase in this causes the heart rate and stroke volume to increase. During exercise the increase venous return of blood to the heart this is done by way of the skeletal muscle pump and also by the respiratory pump. When there is an increase in the venous return it leads to an increase in end diastolic volume, which then causes the stroke volume to be increased.
The most important factor of the flow of blood being monitored correctly during exercise is local metabolic control, this is vasodilation of the skeletol muscle arterioles. During exercise the muscle activity increases which causes the build up of metabolites and that then induces the vasodilation of the local arterioles. As well as this the beta adrenergic stimulation by epinephrine causes vasodilation of arterioles in the skeletal muscles.
Leading from the alpha adrenergic sympathetic stimulation, arterioles in the viscera and skin vasocnstrict during exercise, this is vasoconstriction of arterioles in the viscera and skin. During exercise our body temperature rises, cutaneus arterioles dilate in order to radiate heat and reduce body temperature.
So overall during exercise our heart rate increases causing the blood flow to increase and rise towards the skin, the increase of blood flow also allows more blood to go towards the skeletal muscles due to them working harder and needing the energy produced to allow them to work correctly and effectively.
Blood During Exercise
------------------------------------------
This blog is looking at how blood redistributes during exercise, during exercise our blood flow increases due to the increase in the heart rate. When at rest the blood flow to our muscles is only around 20 -25% but during exercise that increases to around 80 - 85% (biosbcc.net). The increase in the blood flow to our skeletal muscles is iniciated by three things, an increase in our cardiac output, vasodilation of skeletal muscle arterioles and vasoconstriction of arterioles in the viscera and skin.
The increase in our cardiac output is caused by the sympathetic nervous system, the increase in this causes the heart rate and stroke volume to increase. During exercise the increase venous return of blood to the heart this is done by way of the skeletal muscle pump and also by the respiratory pump. When there is an increase in the venous return it leads to an increase in end diastolic volume, which then causes the stroke volume to be increased.
The most important factor of the flow of blood being monitored correctly during exercise is local metabolic control, this is vasodilation of the skeletol muscle arterioles. During exercise the muscle activity increases which causes the build up of metabolites and that then induces the vasodilation of the local arterioles. As well as this the beta adrenergic stimulation by epinephrine causes vasodilation of arterioles in the skeletal muscles.
Leading from the alpha adrenergic sympathetic stimulation, arterioles in the viscera and skin vasocnstrict during exercise, this is vasoconstriction of arterioles in the viscera and skin. During exercise our body temperature rises, cutaneus arterioles dilate in order to radiate heat and reduce body temperature.
So overall during exercise our heart rate increases causing the blood flow to increase and rise towards the skin, the increase of blood flow also allows more blood to go towards the skeletal muscles due to them working harder and needing the energy produced to allow them to work correctly and effectively.
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