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Alpha type receptors. Alpha receptors are found in smooth muscle surrounding blood vessels of peripheral circulation. Stress â epinephrine â muscles contract â constrict peripheral circulation â direct blood to essential organs for responding to stress (heart, lungs, skeletal muscle).lpha type receptors. Alpha receptors are found in smooth muscle surrounding blood vessels of peripheral circulation. Stress â epinephrine â muscles contract â constrict peripheral circulation â direct blood to essential organs for responding to stress (heart, lungs, skeletal muscle).
2. Using different receptors & second messengers in different cell types (See Becker fig. 14-23 (10-24). An example -- effects of epinephrine (adrenaline) on smooth muscle. Some smooth muscles relax, and some contract in response to epinephrine. In this case, different receptors & 2nd messengers are involved. How does this work? See below.