Voltage-gated calcium channels: O a. are always open, and allow calcium ions to move across the membrane to maintain equ

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Voltage-gated calcium channels:
O a. are always open, and allow calcium ions to move across the membrane to maintain
equilibrium.
O b. open when the inside of the cell reaches a certain membrane potential, and allow
movement of calcium ions down their concentration gradient.
c. open when the inside of the cell reales a certain membrane potential, and pump calcium
ions against their concentration gradicnt.
O d. open when bound by the appropriate ligand, and allow movement of calcium ions down
their concentration gradient.
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