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Old 09-05-2016
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Default How sympathetic activity inc venous return?

Can anyone explain-

How sympathetic activity increases venous return?
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Old 09-05-2016
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Sympathetics --> Increased contractility of heart --> increased preload
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Old 09-05-2016
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Stethoscope

Quote:
Originally Posted by mrwonderful View Post
Sympathetics --> Increased contractility of heart --> increased preload
U r missing some steps there:
Incr Contractility --> Decreased telesystolic pressure in the ventricle (as most of the blood leaves the chamber) will facilitate the blood pass from A-V but this is a minor mechanism.
The most important one is the venous constriction. That increases preload (Doesn't let the blood pool in the periphery)
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