In nearsightedness,
a. the sufferer cannot see things that are nearby.
b. distant objects are blurry because the image is focused in front of the retina.
c. the problem cannot be corrected by eyeglasses.
d. the image is focused behind the retina.
e. the retina begins to degenerate, making images fuzzy.
B
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If a toxin blocks the receptors for the neurotransmitter on the postsynaptic muscle cell,
____________________.
a. paralysis will occur b. the person will have a seizure c. the action potential in the presynaptic cell fails d. calcium, which can function as a neurotransmitter, will be released
The molecule shown above is a(n) ____
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