A threshold potential is
a. the same value in every cell
b. the peak potential achieved during an action potential.
c. the point at which there is an explosive increase in Na+ permeability.
d. the potential at which K+ permeability increases.
e. always a positive potential.
C
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________ are short segments of intestine that alternately contract and relax. They are responsible for ________.
Fill in the blank(s) with the appropriate word(s).
What occurs when gamma motor neurons to a muscle are activated?
A. The muscle spindle goes slack. B. The contractile ends of intrafusal fibers elongate. C. The muscle lengthens. D. Extrafusal muscle fibers within that muscle are inhibited from contracting. E. Action potential firing increases in afferent neurons from the muscle spindles.
Which statement comparing the autonomic and somatic nervous systems is not true?
A. The somatic motor division is strictly voluntary, and the autonomic division is completely involuntary. B. The primary effectors of the ANS are viscera of the abdominal and thoracic cavities in contrast to the somatic motor division, which targets skeletal muscles. C. Both the somatic motor division and the ANS are categorized as part of the peripheral nervous system. D. Both the autonomic and somatic divisions carry motor fibers. E. The somatic motor division requires one neuron to reach an effector in contrast to the ANS, which requires two neurons to cause an effect.
Which of the following is/are accurate formula(s) for angular momentum?
A. H = Iw B. H = mk2w C. M = mv D. both A and B E. all of the above