Electrical stimulation of a cardiac muscle cell is the definition of which of the following?
a. Contraction c. Polarization
b. Refraction d. Depolarization
ANS: D
The action potential begins when the cell membrane of the excitable cell is exposed to a depolar-izing current and eventually reaches its excitation threshold potential. This is known as depolari-zation.
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Which is the antagonistic muscle of rhomboid major?
a. Pectoralis major b. Rectus abdominis c. Serratus anterior d. Levator scapulae
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Perception of visual stimuli occurs in the:
a. Primary visual cortex b. Visual association cortex c. Thalamus d. Hypothalamus
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