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Responses of the Whole cardiovascular system


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[Front]


When eating a meal, what changes happen to blood vessels
[Back]


Increased gut activity leads to vasodilation Total resistance then falls so arterial pressure falls and venous pressure increases Rise in venous pressure causes a rise in cardiac output while fall in arterial pressure increases cardiac output and heart rate Venous pressure reduced due to extra pumping of the heart

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Responses of the Whole cardiovascular system - Marcador

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Responses of the Whole cardiovascular system - Detalles

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When eating a meal, what changes happen to blood vessels
Increased gut activity leads to vasodilation Total resistance then falls so arterial pressure falls and venous pressure increases Rise in venous pressure causes a rise in cardiac output while fall in arterial pressure increases cardiac output and heart rate Venous pressure reduced due to extra pumping of the heart
Why is there a risk of pulmonary oedema during exercise
Due to the drastic increase in venous pressure This tends to overfill the heart since the outputs of the right and left ventricles cannot be matched This can be prevented by a rise in heart rate which occurs when exercise begins
What events in the blood vessels happen when standing up
Due to gravity, blood pools in the superficial veins in the legs So central venous pressure falls By starling's law, arterial pressure falls as well This is detected by the baroreceptors which raises heart rate TPR is increased to defend arterial pressure
What events can a hemorrhage lead to
Reduced blood volume lowers venous pressure so cardiac output falls Due to starling's law there is a decrease in arterial pressure as well Baroreceptors detect this which raises heart rate Heart rate increases which increases arterial pressure but not venous pressure TPR also increases which helps arterial pressure but not venous pressure So it does not solve the problem --> oedema etc.