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You have been sitting on a plane for six hours without moving. Blood has been pooling in your veins. When you stand up, you feel dizzy. Why do you think this is? Include in your answer a discussion of stroke volume and mean arterial pressure. (Hint: dizziness is often due to reduced blood flow to the brain.)

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Answer:

This happens because of what is called Orthostatic hypotension. This is a form of blood pressure that  happens when you stand up from sitting or lying down. This hypotension can make you feel dizzy or lightheaded, and maybe in some situations or ocassions even to faint.

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