Which of the following IS NOT an enzyme involved in scavenging reactive oxygen species?
a. superoxide dismutase.
b. catalase.
c. glutathione peroxidase.
d. ascorbate.
D
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The primary nutrient source for early embryonic development that later becomes an important site for blood formation is the
A) amniotic fluid. B) placenta. C) basal decidua. D) umbilical vein. E) yolk sac.
Tetrodotoxin is a toxin that blocks voltage -gated sodium channels. What effect does this substance have on the function of neurons?
A) The absolute refractory period is shorter than normal. B) The toxin does not interfere with neuron function because the voltage -regulated sodium channels would still function. C) The neuron is not able to propagate action potentials. D) Neurons depolarize more rapidly. E) Action potentials lack a repolarization phase.
Which hormone had the greater effect on urine volume?
A) aldosterone B) ADH C) Both ADH and aldosterone had an equal effect on urine volume. D) Neither ADH nor aldosterone affected urine volume.
Which of the artery types contain the internal and external elastic laminae?
A. Elastic and muscular arteries B. Arterioles C. Elastic arteries D. Elastic arteries and arterioles E. Muscular arteries