What are pluripotent stem cells?
A. Cells that are able to develop only into one mature cell type.
B. Cells found only in the bone marrow that can differentiate into any kind of blood cell.
C. Cells found only in adult tissue that replace cells that have died or become damaged.
D. Cells from pre-embryos that can develop into any type of embryonic or adult cell.
E. Very strong cells that can assume the function of any cell type in the body.
D. Cells from pre-embryos that can develop into any type of embryonic or adult cell.
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Which of the following is a function of spermatogonia?
A) secretion of ABP B) support of spermiogenesis C) secretion of inhibin D) sperm production E) support of spermatogenesis
Varicosities
a. are bulges at the end of certain types of nerve terminal branches b. can be found on the postganglionic autonomic fibers associated with certain smooth muscle cells c. contain neurotransmitter d. all of these e. none of these.
Most CO2 is transported in the blood
A. in the form of bicarbonate ions. B. in the form of carbonic acid. C. dissolved in the plasma. D. bound to hemoglobin. E. by the leukocytes.
We can stimulate amphibians to ovulate by injecting ________
A) thyroid hormone B) growth hormone C) estrogen and progesterone D) gonadotropins