Question

Norepinephrine works on smooth muscles. Some smooth muscle cells that control blood vessels there are alpha receptors. When norepinephrine binds to those receptors the muscles ________________________, reducing blood flow. But on smooth muscles on other blood vessels there are beta receptors. When norepinephrine binds to those receptors the muscles ________________________, increasing blood flow.

Answer 1

Smooth muscle cells in blood vessels have alpha and beta receptors. Norepinephrine binding to alpha receptors causes muscle contraction and vasoconstriction, reducing blood flow. Norepinephrine binding to beta receptors causes muscle relaxation and vasodilation, increasing blood flow.

Step-by-step explanation:

Smooth muscle cells that control blood vessels have alpha receptors and beta receptors. When norepinephrine binds to alpha receptors, the muscles contract, causing vasoconstriction and reducing blood flow. On the other hand, when norepinephrine binds to beta receptors, the muscles relax, causing vasodilation and increasing blood flow.