BIOL 110-111 Lecture Notes - Lecture 12: Resting Potential, Cell Membrane, Membrane Potential

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amberalligator931

6 Oct 2016

School

University of Scranton

Department

Biology

Course

BIOL 110-111

Professor

Natalie Wentz

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Document Summary

A separation of oppositely charged ions across the plasma membrane of a cell. The sign of the voltage represents the charge inside of the cell. If membrane potential = +30 mv, it is more positive inside of the cell. Creates a concentration gradient for na+ and k+ K+ is pumped into the cell while na+ is pumped out of the cell. Leak channels are channels for specific ions (na+ or k+) that are always open, allowing these ions to leak across the membrane, creates a resting membrane potential. There are more leak channels for k+ than na+, leaving the inside of the cell more negative. The typical value of resting membrane potential is -70 mv. Resting membrane potential is a dynamic steady state. If the membrane potential becomes more negative than -70 mv, it is hyperpolarized. If the membrane potential becomes more positive than -70 mv, it is depolarized. Occurs when a stimulus causes gated channels to open or close.

Related Questions

Which of the following statements about resting membrane potential is not true? Why?

(a) The resting membrane potential for most animal cells is 0 mV, because the positive and negative ions are in balance.

(b) The resting membrane potential for most animal cells is positive, because Na+ ions are so plentiful inside cells.

(c) The resting membrane potential for most animal cells is negative, because the inside of the cell is more negatively charged than the outside of the cell.

(d) At the resting membrane potential, no ions enter or exit the cell.

lemonllama817

Why do ion channels not function like open pores?

What is membrane potential?

How do K⁺ leak channels work? Why is the membrane potential of a resting cell negative?

What is patch clamp recording? What is one of the major insights gained from patch clamp reporting experiments?

Compare and contrast the three types of gated ion channels.

Be familiar with the different parts of a neuron.

During an action potential, what happens to the membrane potential, voltage-gated Na⁺ channels, Na⁺ ions, voltage gated K⁺ channels, K⁺ ions, and Na⁺-K⁺ ion pumps?

When an action potential reaches a synapse, what happens to the Ca²⁺ channels, Ca²⁺ ions, neurotransmitters, transmitter-gated ion channels, and the post synaptic neuron?

What effect do excitatory or inhibitory neurotransmitters have on postsynaptic cells?

What is an example of a mechanically gated ion channel?

Which of the following is NOT a characteristic of cardiacmembrane depolarization / polarization leading to generation of theaction potential?

a. The presence of a large amount of negative charges inside thecell creates a negative resting potential

b. There is a large amount of potassium inside the cells and alot of sodium outside, creating a membrane potential, which causesopening of Na and K channels, beginning membrane depolarization

c. Along with Na, a large amount of Cl ions also enter thecells, further creating a negative membrane potential

d. In order to restore the resting potential, a Na/K ATPAseremoves 3 Na for every 2 K it takes in from the cytosol, leavingless positive charges inside the cell, returning to a negativepotential

ceriseshark886

BIOL 110-111 Lecture Notes - Lecture 12: Resting Potential, Cell Membrane, Membrane Potential

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