ur and their effectors/targets (fig 6.46) orpinephrine (NE)g a fight-or-flight r

Question

ur and their effectors/targets (fig 6.46) orpinephrine (NE)g a fight-or-flight response, sympathetic neurons will release muscle serving in themooth muscle in the walls of blood vessels serving the heart in onto smooth o General physiological principle: During fight-or-f walls of blood vessels in the small intestin e. In one case the blood vessels dilate as the NE causes the smooth muscle to relax (which case do you thin k this is?) In the other organ, the NE autonomic nervous system can cause opposite effects in differ o contract. Explain how the same transmitter from the same division of the ent organs.

Explanation / Answer

During a fight or flight reaction, sympathetic neurons of the autonomic nervous system releases the hormone norepinephrine (NE). NE acts through its receptors alpha and beta to exert their effect.

In heart, NE acts through alpha1 receptor. This results in vasoconstriction. The receptors present in the blood vessels of the smooth muscles are of beta2 type. When NE acts through beta2 receptors, vasodilation occurs.

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