The precursor to testosterone is
a. aldosterone.
b. cortisol.
c. dehydroepiandrosterone.
d. estradiol.
e. testosterone.
C
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There are about 10 times as many species of anurans as there are species of salamanders. Can you think of a reason why anurans might be a more successful form of amphibian than salamanders are?
What will be an ideal response?
Where are unmyelinated nerve fibers surrounded by Schwann cells?
A. In the CNS B. In the PNS and CNS C. In the PNS D. Nowhere. Unmyelinated nerve fibers are never surrounded by Schwann cells.
Before the discovery of these glands, thyroid surgery often led to a rapid drop in blood calcium levels, which triggered muscle contractions and cardiac arrhythmias. What glands are these and which hormone is lacking?
A) thyroid glands; calcitonin B) parathyroid glands; calcitonin C) parathyroid glands; parathyroid hormone D) thyroid glands; levothyroxine E) parathyroid glands; levothyroxine
The process by which a blood clot dissolves is called __________.
a) thrombolysis b) anticoagulation c) coagulation d) clot retraction