6. Which of the following statements concerning the differences between action potentials in skeletal muscle cells and in ventricular cardiac muscle cells is TRUE? A)The efflux of K+ repolarizes skeletal muscle cells after an action potential, while repolarization in cardiac muscle cells is due to the efflux of Ca2+ B)Unlike skeletal muscle cells, the initial depolarization of ventricular cells is mainly due to Ca2+ influx, not Na+ influx C)Action potentials in skeletal muscle cells are longer in duration than action potentials in cardiac muscle cells D)After sodium influx through voltage gated channels occurs in ventricular cells, prolong influx of calcium from the extracellular fluid occurs. No such calcium influx occurs in skeletal muscle cells. E)Like skeletal muscle cells, ventricular cardiac muscle cells have a resting potential primarily dependent on sodium.
6. Which of the following statements concerning the differences between action potentials in skeletal muscle cells and in ventricular cardiac muscle cells is TRUE? A)The efflux of K+ repolarizes skeletal muscle cells after an action potential, while repolarization in cardiac muscle cells is due to the efflux of Ca2+ B)Unlike skeletal muscle cells, the initial depolarization of ventricular cells is mainly due to Ca2+ influx, not Na+ influx C)Action potentials in skeletal muscle cells are longer in duration than action potentials in cardiac muscle cells D)After sodium influx through voltage gated channels occurs in ventricular cells, prolong influx of calcium from the extracellular fluid occurs. No such calcium influx occurs in skeletal muscle cells. E)Like skeletal muscle cells, ventricular cardiac muscle cells have a resting potential primarily dependent on sodium.
Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
Section: Chapter Questions
Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...
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6. Which of the following statements concerning the differences between action potentials in skeletal muscle cells and in ventricular cardiac muscle cells is TRUE?
A)The efflux of K+ repolarizes skeletal muscle cells after an action potential, while repolarization in cardiac muscle cells is due to the efflux of Ca2+
B)Unlike skeletal muscle cells, the initial depolarization of ventricular cells is mainly due to Ca2+ influx, not Na+ influx
C)Action potentials in skeletal muscle cells are longer in duration than action potentials in cardiac muscle cells
D)After sodium influx through voltage gated channels occurs in ventricular cells, prolong influx of calcium from the extracellular fluid occurs. No such calcium influx occurs in skeletal muscle cells.
E)Like skeletal muscle cells, ventricular cardiac muscle cells have a resting potential primarily dependent on sodium.
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