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Home Q & A Board Biology-Related Homework Help Anatomy and Physiology
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lei.frank lei.frank
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11 years ago
I have that vasoconstriction increases blood pressure, but why is it that in blood capillaries, the blood pressure drops.
It seems like a contradiction, so can you clarify this?

Thanks
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datguydatguy
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11 years ago
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11 years ago
1. "Blood pressure" means "blood pressure in arteries" unless explicitly stated as the pressure in a particular vessel or set of vessels e.g. jugular venous pressure, central venous pressure, etc.

2. The "resistance vessels" in the circulation (the ones that have the most resistance and biggest effect on blood pressure) are the very small arteries (the arterioles). These are downstream of the arteries (where "blood pressure" is measured) and upstream of capillaries.

3. Vasoconstriction (of the resistance vessels) - arterial pressure goes up, capillary pressure goes down.

So no contradiction, just have to be aware that unspecified blood pressure = arterial blood pressure.
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