Epinephrine and Norepinephrine That Are Released from the Adrenal Glands

question 78

Multiple Choice

Epinephrine and norepinephrine that are released from the adrenal glands affect target tissue for a longer period of time than the same substances released from neurons at their peripheral receptors.Why?

• A) The adrenal gland releases larger amounts of the neurotransmitters than the neurons.
• B) The hormones released from the adrenal glands bind to different receptors than those released from neurons.
• C) There are no enzymes to break down epinephrine and norepinephrine in the blood and very little in peripheral tissues.
• D) The effectors are less sensitive to epinephrine and norepinephrine released by the adrenal glands.
• E) The epinephrine and norepinephrine from the adrenal glands are released by sympathetic neurons, whereas parasympathetic neurons release these substances at the effector organs.

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