Why are there so many phagocytic cells (in lymph nodes and the liver, for example) associated with the digestive system?
A. They stimulate contractions of the tunica muscularis.
B. They stimulate proliferation of stem cells.
C. They remove bacteria and other foreign material ingested with food.
D. They can transform into other cell types under the appropriate hormonal stimulation.
E. They stimulate digestive enzyme production.
Answer: C
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The blastocyst implants in the uterus on about the ________ day of the 28-day menstrual cycle. At this time, the endometrium is ________ and progesterone levels are ________.
A. 14th; thick and secretory; low B. 28th; thin and proliferating; high C. 21st; thin and proliferating; low D. 28th; thick and secretory; low E. 21st; thick and secretory; high
A receptor that contains many mechanically-gated ion channels would function best as a
A) tactile receptor. B) chemoreceptor. C) photoceptor. D) thermoreceptor. E) light receptor.
All of the following are true of steroid hormones except that they
A) are produced by the adrenal medulla. B) are derived from cholesterol. C) are produced by reproductive glands. D) bind to receptors within the cell. E) are lipids.
Spermatogonia divide by what process?
A. Mitosis B. Meiosis C. Both answers are correct. D. None of these are correct.