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

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.

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

Why is the outside of a neuron positively charged?Multiple Choicebecause sodium ions gather around the outside of the cell membranebecause calcium ions gather around the outside of the cell membranebecause potassium ions gather around the inside of the cell membranebecause sodium ions gather around the inside of the cell membranebecause chloride ions gather around the outside of the cell membrane

Sodium ions move into a neuron during Blank______.Multiple choice question.repolarizationdepolarization

Movement of Na+ ions into a nerve cell during the upstroke of an action potential is an example of of the following transport mechanismSelect one:a. Facilitated diffusionb. Co-transportc. Primary active transportd. Simple diffusion