Refer to Figure 42-2. When an electrical impulse travels along the neuron labeled 2:
a. the hand will be extended.
b. the hand will be withdrawn.
c. the fingers will flex.
d. the fingers will extend.
e. the hand will remain stationary.
B
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After the depolarization phase of an action potential, the resting potential is restored by _____
A) the opening of sodium activation gates B) the opening of voltage-gated potassium channels and the closing of sodium channels C) a decrease in the membrane's permeability to potassium and chloride ions D) a brief inhibition of the sodium-potassium pump E) the opening of more voltage-gated sodium channels
Which tissue acts to transport nutrients and wastes throughout the body?
a. blood b. adipose tissue c. loose connective tissue d. fibrous connective tissue e. cartilage
The type of receptor that consists only of a naked nerve fiber ending is called a
A. Pacinian corpuscle. B. Meissner's corpuscle. C. nociceptor. D. cochlear hair cell. E. cone.
Inbreeding is less likely to produce offspring that are homozygous for a harmful recessive trait.
a. true b. false