Physiology Test Question

The spike phase of the action potential of the sinoatrial node pacemaker cells of the heart is caused by:

	(A) Opening of voltage-gated Na⁺ channels
	(B) Opening of voltage-gated Ca²⁺ channels
	(C) Closure of voltage-gated K⁺ channels
	(D) Opening of voltage-gated Cl⁻ channels
	(E) Closure of voltage-gated Ca²⁺ channels

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Posted: Saturday, August 9, 2014

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