Adrenaline works on beta 1 and beta 2 receptors so...?

Question

It should increase Heart rate cos B1

It should vasodilate cos of beta2, HOWEVER it also stimulates alpha recptors (?which one I dunno) but that causes vasoconstriction... Which one predominates?

Also if you can tell me anything I missed here, let me know.

Appreciated

:)

Answer 1

it vasoconstricts AND vasodilates. The difference is which tissues have which receptors. Vasoconstriction predominates in the visceral organs and the skin, where as vasodilation occurs in the skeletal muscle.