The conversion of ammonia into a less toxic substance produces
A) ketone bodies.
B) urea.
C) nitrate.
D) acetyl-CoA.
E) water.
B
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When you wear a backpack, your center of gravity shifts in which direction?
A. up B. back C. forward D. up and back
Which of the following statements is most correct regarding the intracellular chemical signals known as "second messengers"?
A) Second messengers usually inactivate protein kinase enzymes. B) Second messengers usually act to remove nitric oxide (NO) from the cell. C) Cyclic AMP and calcium may be second messengers. D) Second messengers act through receptors called K-proteins.
Serum is not identical in composition to plasma
Indicate whether the statement is true or false
Vasoconstriction
a. refers to a decrease in the radius of a vessel. b. of an arteriole decreases blood flow through that vessel. c. of an arteriole is controlled by the parasympathetic system d. both (a) and (b) above. e. all of these answers.