Ion Channels in Physiology Quiz

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Questions and Answers

Leak/leakage ion channels are always ______

open (open and close randomly)

Leak/leakage ion channels are responsible for the resting membrane potential for example ______ and Na+ leak channel

K+

Voltage gated channels are activated by changes in the electrical membrane potential near the ______

channels

Ion channels allow only ions of certain ______ or size

charge Signup and view all the answers

The rate of transport through the channels is very ______

high Signup and view all the answers

Selective permeability : ion channels allow only ions of certain ______ or size

charge Signup and view all the answers

Ion channels pass through the channels down their ______ gradient

electrochemical Signup and view all the answers

Ion channels that are activated by changes in the electrical membrane potential near the ______

channels Signup and view all the answers

Gated channels has a gate which opens or closes in response to specific ______

stimuli Signup and view all the answers

Rate of transport through the channels is very ______ than Carrier protein (×1000 )

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Flashcards

Leakage Ion Channels

Channels that are always open, allowing ions to pass through randomly, contributing to the resting membrane potential.

K+ Leak Channels

Primarily responsible for establishing the resting membrane potential, these channels selectively allow potassium ions (K+) to leak out of the cell.

Voltage-Gated Channels

Open and close in response to changes in the electrical potential across the cell membrane near the channel itself.

Selective Permeability

Ion channels exhibit selective permeability by allowing only ions with a specific charge and size to pass through.

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High Transport Rate

The rate at which ions are transported through ion channels is very high compared to carrier proteins.

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Electrochemical Gradient

The combined influence of the concentration gradient and electrical gradient on the movement of ions across a membrane.

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Gated Channels

Possess a gate mechanism that opens or closes in response to specific stimuli such as voltage changes or ligand binding.

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Study Notes

Ion Channels

Leak/leakage ion channels are always open, responsible for maintaining the resting membrane potential.
Examples of leak/leakage ion channels include K+ and Na+ leak channels.
Voltage-gated channels are activated by changes in the electrical membrane potential near the axon hillock.
Ion channels are selective, allowing only ions of certain charge or size to pass through.
The rate of transport through the channels is very fast, approximately 1000 times faster than carrier proteins.
Ion channels allow ions to pass through down their concentration gradient.
Gated channels have a gate that opens or closes in response to specific stimuli, such as changes in electrical membrane potential.
Voltage-gated channels are a type of gated channel that responds to changes in electrical membrane potential near the axon hillock.