The male and female reproductive systems begin as an indifferent stage. If testosterone is present, which of the following occurs?
A. The paramesonephric duct forms the vagina.
B. The mesonephric ducts form the ductus deferens.
C. The mesonephric ducts atrophy.
D. The paramesonephric ducts enlarge to form the scrotum.
E. The paramesonephric duct atrophies.
B
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A single stimulus that elicits several responses involves which type of neuronal circuit?
A) convergent pathway B) divergent pathway C) reverberating circuit D) parallel after-discharge circuit
Sympathetic nerves
A) provoke feelings of sympathy. B) allow us to relax, rest, and recover. C) are bundles of postganglionic fibers that innervate organs within the thoracic cavity. D) control swallowing. E) stimulate gastric secretion.
Molecules that do not readily dissolve in water are called
A) hydrophobic. B) hydrophilic. C) electrolytes. D) isophilic. E) isophobic.
In mitosis, which structure anchors the spindle fibers to the chromosome?
A. Aster B. Mitotic spindle C. Centromere D. Kinetochore E. Chromatid