The physiologic event that takes place at the plasma membrane of a skeletal muscle fiber is
a. release of calcium.
b. propagation of an action potential.
c. binding of calcium by troponin.
d. crossbridge cycling.
b. propagation of an action potential.
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When one or more presynaptic neurons fire in rapid order it produces a much greater depolarization of the postsynaptic membrane than would result from a single EPSP; this event is called ________ summation.
Fill in the blank(s) with the appropriate word(s).
which of the following is false
A) cardiac muscle contraction cannot be summated B) skeletal muscle contraction may be summated C) skeletal muscle control is neural D) cardiac muscle control is neural only E) Cardiocytes are interconnected through intercalated discs
Beginning inferior to the urinary bladder, sperm travel to the exterior through the urethral regions in what sequence?
a. prostatic urethra, spongy urethra, membranous urethra b. prostatic urethra, membranous urethra, spongy urethra c. membranous urethra, prostatic urethra, spongy urethra d. spongy urethra, prostatic urethra, membranous urethra
Which of the following statements is NOT true of hyperopia?
A. Close objects are fuzzy B. Corrected by "minus" lenses C. Corrected by convex lenses D. Image focused behind the retina E. Eyeball is too short