Muscle tone is maintained and modified by:
a. Gamma motor neurons
b. Type II afferent axons
c. Upper motor neurons in the corticospinal tracts
d. Autonomic neurons
A
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A second-degree heart block, Mobitz type I, occurs when:
A) every other impulse generated by the SA node is blocked at the AV node and does not depolarize the ventricles. B) each successive impulse is progressively delayed, until one impulse is blocked from entering the ventricles. C) the PR interval progressively grows narrower, until there is a P wave that is not followed by a QRS complex. D) more than one successive impulse from the SA node is blocked at the AV node and is not allowed to enter the ventricles.
How often should hydrant inspection occur?
A. Once a year B. At least twice a year C. At least once every three years D. At least once every five years