Which of the following events occurs during the lag phase of a muscle twitch?
A. Muscle fibers shorten.
B. Cross-bridges form, move, release, and reform many times.
C. The action potential is propagated from presynaptic to postsynaptic membrane.
D. Calcium is pumped back into the sarcoplasmic reticulum.
E. All of these events occur in the lag phase.
C
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A. Z disc B. H band C. A band D. I band
Muscles that have their fasciculi arranged like barbs of a feather along a common tendon are called ________.
A. straight B. divergent C. pennate D. rhombohedral E. orbicular
Which hormone increases the blood calcium level?
A. Calcitonin B. Thyroid hormones C. Growth hormone D. PTH
Which term describes painful periods?
A. Dysmenorrhea B. Mastectomy C. Oophorectomy D. Hysterectomy