Epinephrine and norepinephrine released from the adrenal glands affect target tissue for a longer period of time than the same substances when released from neurons at their peripheral receptors. Why?
A) The adrenal gland releases larger amounts of the neurotransmitters than the neurons.
B) The hormones releases from the adrenal glands bind to different receptors than those released from other neurons.
C) There are no enzymes to break down epinephrine and norepinephrine in the blood and few enzymes in periperal tissues.
D) The effectors are less sensitive to epinephrine and norepinephrine that are released by the adrenal glands.
E) The epinephrine and norepinephrine from the adrenal glands are released by sympathetis neurons, whereas parasympathetic neurons release these substances at the effector organs.
2006-11-28 03:36:08 · 3 answers · asked by Anonymous in Science & Mathematics ➔ Biology
Sorry for my previous answer, I was mistaken.
I believe answer is B. A is correct, but I don't think it is why it affect target tissue for loger time. I don't think C is correct, but it could be. D is certainly wrong and E too. I haven't seen this in a while. Sorry I couldn't be more help.
2006-11-28 04:06:36 · answer #1 · answered by dahfna 3 · 0⤊ 0⤋
Maybe I should sign up for a class in Anatomy and Physiology...# C is definitely a turn on
2016-03-13 00:09:37 · answer #2 · answered by Anonymous · 0⤊ 0⤋
I'm actually going to disagree with the first responder. I think the correct answer is C. Neurons have a rather high concentration of enzyme called monoamine oxidase bound to their membranes. These enzymes breakdown monoamines (epi, norepi, etc.).
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2006-11-28 09:48:46 · answer #3 · answered by Brian B 4 · 2⤊ 0⤋