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The tricuspid valve is closed A.during active filling of the ventricles. B.when the mitral valve is open. C.while the atria are contracting. D.during ejection. E.during passive filling of the ventricles.
Weegy: D.during ejection. the tricuspid valve is closed during systolic ejection. User: When a pacemaker potential in the SA node reaches threshold, A.the permeability to K+ ions increases. B.many voltage-gated Ca2+ channels open. C.voltage-gated Ca2+ channels close. D.RMP has been restored. E.permeability of the cell does not change. (More)
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