The apneustic center
a. is located in the medulla
b. stimulates the inspiratory neurons
c. inhibits inspiratory activity
d. stimulates the pneumotaxic area
e. performs c and d
B
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In the process of continuous propagation, all of the following are true except
A) the action potential is triggered by graded depolarization of the initial segment. B) at threshold, sodium channels begin to open rapidly. C) local currents depolarize the region just adjacent to the active zone. D) depolarization of the axonal membrane only occurs at nodes. E) each step takes about one millisecond.
Secondary hypertension can be caused by ________
A) kidney disease B) stress C) smoking D) obesity
Tendon organs are ________.
A. pain receptors B. nociceptors C. chemoreceptors D. visceral receptors E. proprioceptors
Proteins are composed of units called
A) amino acids. B) simple sugars. C) fatty acids. D) adenosines. E) nucleotides.