BIOLOGY 152 Lecture Notes - Lecture 15: Electric Potential, Axon Hillock, Reuptake

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taupepug232

14 Apr 2017

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There are a hundred billion neurons in the body. The resting membrane potential of a neuron is determined by the movement of potassium ions relative to other ions. Membrane potential: electric potential between inside and outside of membrane. Resting potential: membrane potential of a neuron during rest. Crucial: na+ / k+ pump and k+ leak channels. sodium ions on inside, potassium ions also on inside but leak. Sodium ions moving out of the neurons cytoplasm would result in making the inside more negative relative to the outside (because sodium ions are positively charged) Voltage gated na+ channels open during depolarization phase. Depolarization means making the charge less negative (adding more sodium) Initiation of an action potential decision to fire or not. Ana action potential in the presynaptic neuron does not always lead to an action potential in the postsynaptic neuron, An action potential always has the same shape.

Related Questions

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

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

byzantiumhamster60

BIOLOGY 152 Lecture Notes - Lecture 15: Electric Potential, Axon Hillock, Reuptake

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