ions

| December 4, 2015

A sperm can trigger an action potential in a sea urchin egg because
A. its cytosol contains a lot of calcium ions that, upon fertilization, rush into the egg.
B. its membrane contains ion channels that, upon fertilization, pass an inward current that depolarizes
the egg plasma membrane.
C. its membrane contains ion channels that, upon fertilization, pass an outward current that repolarizes
the egg plasma membrane.
D. its cytosol contains a chemical that tends to pop the voltage-gated calcium channels into an
open state.
E. its cytosol contains a protease that modifies the behavior of voltage-gated calcium channels in
the plasma membrane of the egg.

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Category: Biology

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