During parturition, a positivefeedback mechanism occurs when __________ stimulates the secretion of __________ , which results in uterine contractions.
a. progesterone, estrogen
b. estrogen, progesterone
c. estrogen, oxytocin
d. oxytocin, estrogen
e. uterine stretch, oxytocin
Answer: e
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Biology
- The osmoregulatory/excretory system of a freshwater flatworm is based on the operation of _____.
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- Components of the transulfuration pathway include all of the following except _____.
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- Amino acids whose degradation yields a-ketoglutarate include all of the following except _________.
- Amino acids whose degradation yields succinyl-CoA includes all of the following except ________.
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- The fixation of nitrogen requires _______.
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- SAM is a methyl donor in the synthesis of ______.
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- All of the following are purine bases except _____.