The stage of a muscle twitch that occurs from the point of stimulation to the beginning of contraction is called the ________ period.
A. contraction
B. lag
C. latent
D. refractory
Answer: C
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Which is most directly responsible for the falling (repolarizing) phase of the action potential?
A. The permeability to Na+ increases greatly. B. The Na+, K+ pump restores the ions to their original locations inside and outside of the cell. C. ATPase destroys the energy supply that was maintaining the action potential at its peak. D. Voltage-gated Na+ channels are opened. E. The permeability to K+ increases greatly while that to Na+ decreases.
Sympathetic nerves may leave the spinal cord at which vertebra?
A) first coccyx B) third lumbar C) first thoracic D) second cervical
Which of the following could result from an overly zealous exercise program?
A. Mononucleosis B. Polycythemia C. Leukopenia D. Leukocytosis E. Hypoplastic anemia
Smooth muscle cells
A) have to be innervated by motor neurons. B) are larger than cardiac muscle cells. C) are multinucleate. D) contain intercalated discs. E) are spindle-shaped.