Plasma proteins essential in body defense are the
A) albumins.
B) fibrinogens.
C) immunoglobulins.
D) metalloproteins.
E) lipoproteins.
C
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Acetylcholine slows the heart rate by
A) increasing the permeability to K+ and decreasing the permeability to Ca2+. B) just increasing the permeability to K+. C) just increasing ion influx, thus increasing the rate of depolarization. D) just decreasing the permeability to Ca2+. E) just increasing the permeability to Ca2+.
Which nephron structure is especially important in the kidney's ability to produce urine of varying concentration?
a. Bowman' capsule b. proximal tubule c. distal tubule d. loop of Henle e. glomerulus
When ATP levels are low, the relationship between ATP and creatine phosphate is that
A. ATP supplies energy to synthesize creatine phosphate from creatine and phosphate. B. creatine phosphate supplies energy to regenerate ATP from ADP and phosphate. C. both are required to stimulate a muscle to contract. D. both have three phosphate groups.
Juvenile-onset type 1 diabetes is often suspected by parents because of which change in the child's appearance or behavior?
A. sudden increase in muscle mass B. darkening of the skin C. increased thirst and frequency of urination D. puffiness around the face E. early (precocious) pubertal growth spurt