When childbirth labor starts, the presence of the hormone oxytocin causes the contractions to increase in strength, which causes the level of oxytocin to increase, which in turn causes the contractions to further strengthen. This would be an example of a
________ feedback mechanism.
A) positive
B) neutral
C) negative
Answer: A
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Upon examination of a zygote, a developmental biologist discovers that it possesses 47 chromosomes. What does this indicate?
A. Either the sperm or the egg had one less chromosome than normal as the result of a meiotic error B. Either the sperm or the egg received an extra chromosome as the result of a meiotic error C. The zygote is a normal, healthy diploid zygote D. The zygote resulted from polyspermy (multiple fertilizations of the same oocyte) by two sperm cells
The ______ foot muscles are located in the leg.
a. extrinsic b. intrinsic
After properly positioning the patient's head for intubation, you should open his or her mouth and insert the blade:
A) into the right side of the mouth and sweep the tongue to the left. B) in the midline of the mouth and gently lift upward on the tongue. C) into the left side of the mouth and move the blade to the midline. D) in the midline of the mouth and gently sweep the tongue to the left.
Blood flow is greatest at the ________ of the lungs and perfusion is greatest at the ________ of the lungs.
A. base; base B. base; apex C. apex; apex D. apex; base