Nitric oxide (NO) causes ________.
A. no effect
B. vasoconstriction
C. vasodilation
Answer: C
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Why does meiosis pass through two complete cycles?
A. Because two cycles are necessary to produce the proper shape of the gametes B. So that the zygote will have the diploid number of chromosomes C. Because the chromosomes are still double-stranded at the end of meiosis I D. To allow crossing over to occur E. To assure that the gametes will be of the correct size
The hormone that lowers the calcium and phosphate ion concentration of the blood by inhibiting the release of calcium phosphate ions from the bones and increasing the excretion of these ions by the kidneys is
A. vasopressin B. serotonin C. melatonin D. calcitonin
Paramesonephric ducts degenerate when the hormone ________ is present.
A. AMH B. estrogen C. testosterone D. inhibin E. TSH
The gray matter on the outer surface of the cerebrum is called the
A. cortex. B. pia mater. C. reticular formation. D. arbor vitae. E. cerebral medulla.