The action potentials are slowed at the AV node to allow the
A. ventricles to repolarize.
B. ventricles to completely empty of blood.
C. pacemaker to reset for the next beat.
D. atria to complete their contraction.
E. atria to begin their contraction.
D
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Osteoclast-activating factor does all of the following except that it
A) is released in large amounts early in life. B) increases the number of osteoclasts. C) increases the activity of osteoclasts. D) produces a severe osteoporosis. E) is released by some cancer tumors.
The inability of muscle cells to relax due to high frequency stimulation is called ________.
A. twitch B. treppe C. tetanus D. recruitment
In which part of a neuron does Wallerian degeneration occur?
A) cell bodies of CNS neurons B) cell bodies of PNS neurons C) axons of PNS neurons D) axons of CNS neurons E) dendrites of the PNS neurons
Myofibrils are bundles of
A. sarcoplasmic reticuli. B. myofilaments. C. muscles. D. muscle fibers.