Consider the difference between lifting a light pad of paper versus a heavy textbook. The primary way the level of force of muscle contraction is controlled is by
A. recruiting a different number of motor units.
B. activating different regions of the muscle.
C. activating the motor units at a different frequency.
D. altering the number of crossbridges each individual fiber uses.
A
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Within a myofibril each myosin filament is surrounded by ________ actin filaments
Fill in the blank(s) with the appropriate word(s).
Involuntary cardiac muscle fibers on the heart are innervated by
A) preganglionic fibers. B) visceral motor fibers. C) sensoriganglionic fibers. D) somatic motor fibers. E) All of the answers are correct.
Muscularis externa typically contains an inner circular layer and an outer longitudinal layer
Indicate whether the statement is true or false
Which statement about the follicular phase is false?
A. The anterior pituitary secretes FSH, which targets the primordial follicle. B. Estrogen levels reach a peak just before day 5. C. The primordial follicle secretes estrogen. D. All of the answers are true.