n normal neurons, K+ flows down concentration gradient out of cell, and Na+ flows down concentration gradient into cell.Group of answer choicesTrueFalse

Which of the following is false regarding Na+ ion channels in a neuron?Group of answer choicesTheir concentrations are highest at the nodes of Ranvier.Na+ can move from an area of high concentration inside a cell to an area of low concentration outside the cell through these channels.They permit the movement of Na+ ions in only one direction.The Na+ ion channels are integral membrane proteins.

If a neuron is first measured at normal resting potential, but later is found to require application of +3 mA of current to return to –60 mV, which of the following could explain the neuron’s net ion flow between the two measurements?A.Positive ions flowed into the cellB.Positive ions flowed out of the cellC.Negative ions flowed out of the cellD.Sodium ions flowed into the cell

The information flow through a neuron typically follows the route:Group of answer choicescell body ===> dendrite ==> axon ==> presynaptic membranedendrite ==> cell body ===> axon ==> presynaptic membranepresynaptic membrane ==> axon ==> cell body ===> dendriteaxon ==> cell body ===> dendrite ==> presynaptic membrane

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

The channels that provide for the movement of potassium in the resting neuron are _______.leakage and chemically gated.chemically gatedleakagevoltage gated