cell membranes

| December 4, 2015

1. A sea urchin egg is used in a voltage clamp experiment; that is, the value of the transmembrane
voltage is set by the experimenter, not by the properties of the membrane.
The transmembrane voltage is held at +10 mV for one minute. At the end of that time
A. the voltage-gated calcium channels are all open.
B. the voltage-gated calcium channels are all inactivated.
C. the voltage-gated calcium channels have recovered from inactivation.
D. the voltage-gated calcium channels are going through cycles of opening and inactivation as the
cell generates repetitive action potentials.
E. any of answer A though D above could occur, depending on the density of potassium channels.

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