The pacemaker potential results from the opening of ____ channels in the plasma membrane of the ____ cell, leading to ____ influx.Group of answer choicesFunny; autorhythmic; K+Ca2+; contractile; Ca2+Funny; autorhythmic, Na+Funny; contractile; Na+

What channels are open during the second part of slow depolarization in pacemaker cells?Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer.aVoltage-gated L-type calcium channelbVoltage-gated T-type calcium channelscVoltage-gated potassium channelsdFunny sodium channels

When traveling along an axon, the cell membrane immediately ahead of an action potential depolarizes because of _________blank.Multiple Choicethe sodium/potassium pumpmembrane receptorsdiffusion of sodium currentdecreased membrane permeabilitypotassium efflux

An ______ postsynaptic potential involves the opening of sodium channels, depolarizing the membrane, and bringing it closer to a threshold level.Multiple choice question.excitatoryinhibitory

Membrane potential depolarizes, Na+ channels open, Na+ current increases, _______.Group of answer choicesK+ channels openNa+ channels closeNa+ current decreaseNa+ current increasemembrane potential hyperpolarizes

Q5. During the plateau phase of the myocardial action potential the membrane is most permeable to _____________ .a) Calcium and potassiumb) Sodium and potassiumc) Calcium and sodiumd) Calcium and magnesium