When the nerve impulse encounters a myelin-covered section of neuron:
a. it moves slower than it would in nonmyelinated sections
b. it stops
c. it jumps over the myelin
d. none of the above
c. it jumps over the myelin
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Betty, an 83 year old woman, is bedfast due to a severely broken hip. Unfortunately, she has developed a decubitus ulcer. What is a decubitus ulcer and what may have caused it to occur?
What will be an ideal response
Which of the following would not result in the dilation of the feeder arterioles and opening of the precapillary sphincters in systemic capillary beds?
A) a local increase in pH B) an increase in local tissue carbon dioxide C) a decrease in local tissue oxygen content D) a local increase in histamine
Vasopressin
a. secretion is stimulated by a water deficit. b. increases the permeability of the distal and collecting tubules to water. c. increases the permeability of the late portion of the collecting tubule to urea. d. both (a) and (b) above. e. all of these answers.
Synapses in which neurotransmitters are released are called ___ synapses.
Fill in the blank(s) with the appropriate word(s).