cell biology

| December 4, 2015

Action potentials in nerve cell axons last a much shorter time than action potentials in
sea urchin eggs because
A. sodium has only a single positive charge while calcium has two.
B. voltage-gated sodium channels are found only at the nodes, while voltage-gated calcium channels
are found over the entire surface of the egg cell.
C. sodium ions are removed rapidly from the cytosol by the Na+/K+ ATPase.
D. voltage-gated sodium channels inactivate more rapidly than do voltage-gated calcium channels.
E. calcium has a higher atomic weight than does sodium and therefore diffuses more slowly.

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