Constriction

It triggers the constriction. For example when you're wounded and you start losing blood, renal afferent artery constricts and you stop losing more water from your body.

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Veins have no smooth muscle to produce a constriction - it's possible that the constriction produced by surrounding tissues (such as skeletal muscles or dermal tightening) was somehow misconstrued as something the veins were doing. I should warn ...

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"Veno-" is a prefix referring to veins. So when the words either constriction or dilation are added after the prefix, it specifically indicates that it's the vein that constricts or dilates.

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I didn't actually read this anywhere, so i might be wrong, but it would make more sense for it to be constriction. Sympathetic innervation is more for special situations, when you have bigger things to worry about than filtering blood.

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Does sympathetic nerve trigger the dilation or constriction of renal afferent artery? thx^^

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