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Old 04-04-2013
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Default Really confused about alpha 1 receptors

Spent so much time on this concept of venous return, and is making my head hurt. If anyone could shed some light.

So Kaplan says, alpha one will give you increase in vascular smooth muscle contraction.

hence: arterioles: You'll see increase TPR and Increase diastolic P. I get this part.

Veins: Increase venous return and Increase preload. I am confused about this part.

Aren't you suppose to get decrease in venous return?

TPR = inverse of Cardiac output. And CO and venous return are synonymous. so why is there increase in venous return?????
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Old 04-04-2013
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when the veins contract ............... dec complaince ..... dec pooling

veins thorugh all the blood to the heart .... so inc venous return ..... inc preload
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Old 04-04-2013
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TPR and vein contraction are two separate concepts? Now not sure.. what i was confused on. THank you!
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