Oxytocin Is a Peptide Hormone That Causes the Smooth Muscle

question 34

Multiple Choice

Oxytocin is a peptide hormone that causes the smooth muscle of the uterus to contract,but it has no effect on the smooth muscle cells of the small intestine.This difference in responsiveness exists because

• A)Oxytocin is inactivated prior to reaching the smooth muscle cells of the intestine
• B)Intestinal smooth muscle cells do not contain the proper second messenger system
• C)Uterine smooth muscle cells contain specific receptors for oxytocin
• D)Oxytocin is able to cross the plasma membrane of uterine cells but not intestinal cells
• E)Oxytocin is not delivered by the circulatory system to intestinal cells

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