You treat an organism with a drug that inhibits calcium permeability in nerve cells specifically. As a result, you expect to see
A) no depolarization of membranes.
B) no repolarization of membranes.
C) failure to achieve the threshold necessary to stimulate a signal.
D) presynaptic neurotransmitter release.
E) no postsynaptic receptors.
D) presynaptic neurotransmitter release.
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The global patterns of atmospheric circulation and precipitation occur because of
A. the cooling of the land. B. rising masses of warm air and sinking masses of cool air. C. the greenhouse effect. D. global differentials in sea surface temperature. E. winds blowing off of the world's major mountain chains.
Cells that are produced during mitosis have _____ of chromosomes and are referred to as ____.
a. one set; diploid b. two sets; diploid c. one set; haploid d. two sets; haploid
If a person has a recessive allele for a disorder and that allele is masked by presence of a normal dominant allele, this person Select one:
a. has the disease but cannot pass this disease to their offspring. b. is termed a linkage group. c. cannot produce gametes. d. is homozygous for the disease. e. is termed a carrier.
In comparison to the systemic circuit, the pulmonary circuit
A) transports deoxygenated blood. B) has lower resistance to blood flow. C) has an equal pressure gradient to drive blood flow. D) has lower blood flow. E) is under greater pressure.