Aging-related decreases in drug metabolism and excretion can lead to ________.
A. a need for greatly increased doses of a drug
B. reduced need for prescription drug use
C. increased benefits from taking a drug
D. toxic accumulation of a drug in the body
Answer: D
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If the tubular maximum for a particular amino acid is 200 mg/100 ml and the concentration of that amino acid in the blood is 100 mg/100 ml, the amino acid
A. will be actively secreted into the filtrate. B. will be completely reabsorbed by the tubule cells. C. will appear in the urine. D. will not appear in the urine. E. None of these choices is correct.
Hemophilia is a disorder in which bleeding is severe and prolonged due to a lack of clotting factor VIII. The factor activation cascade is interrupted at the Factor IX activation step. Which pathway is inhibited by this interruption?
A. The prothrombin clotting mechanism B. The Hageman mechanism C. The intrinsic clotting mechanism D. The extrinsic clotting mechanism
Which of the following is involved in muscle relaxation?
a. Acetylcholinesterase removes ACh and the muscle cell returns to resting potential. b. Ca2+ is actively taken up by the lateral sacs when there is no longer an action potential. c. The cross bridges pull the filaments back to their original resting positions. d. Both a and b e. Both b and c
The regulation of blood flow in the arterioles of the brain is mainly under the control of the sympathetic nervous system
Indicate whether the statement is true or false