Neurons can conduct messages faster if they have
Ans: an axon with a myelin sheath.
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Active hyperemia
a. refers to the arteriolar dilation that occurs within a tissue in response to local chemical changes that accompany increased metabolic activity of the tissue. b. refers to local arteriolar mechanisms that are aimed at keeping tissue blood flow fairly constant in spite of rather wide deviations in mean arterial driving pressure. c. refers to the increase in blood flow to a tissue that occurs after removal of an occlusion of its blood supply. d. is important in maintaining an adequate pressure head to drive blood forward into a tissue. e. none of these answers.
During moderate exercise cerebral blood flow ________.
A. decreases slightly B. remains unchanged C. increases significantly D. increases slightly
Stimulation of the beta receptors on heart muscle cells does not result in
A) the formation of cAMP. B) increased heart rate. C) increased force of contraction. D) increased metabolism. E) inactivation of G proteins.
Rupturing the dermis may cause these to develop
A. reticular layer
B. papillary layer
C. hypodermis
D. epidermis
E. stretch marks