Physiology Neurons Lecture Quizzes

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Questions and Answers

What is the reason for the high membrane permeability of K+ in neurons?

The regulation of ion channel activity
The secondary active transport of K+ ions
The presence of leak channels selective for K+ ions (correct)
The activity of Na+/K+-ATPase pumps

How do leak channels in neurons differ from other ion channels?

They are selective for Na+ ions
They are regulated by ion channel activity
They are involved in secondary active transport
They are constitutively active and randomly switch between open and closed states (correct)

What is the impact of leak K+ channels on the resting membrane potential of a neuron?

They contribute to the negativity of the resting membrane potential (correct)
They increase the positivity of the resting membrane potential
They have no effect on the resting membrane potential
They stabilize the resting membrane potential

Which process affects the membrane potential of a cell based on ion channel activity?

<p>Regulation of ion channel activity (A)</p> Signup and view all the answers

What is the primary function of leak channels in neurons?

<p>$Maintaining$ $the$ $resting$ $membrane$ $potential$ (D)</p> Signup and view all the answers

Flashcards

Leak K+ channels

These channels are always open and allow potassium ions (K+) to flow freely across the neuronal membrane, contributing to the resting membrane potential.

What makes leak channels unique?

They are always open, unlike gated channels that require a stimulus to open.

How do leak channels affect resting potential?

The presence of leak K+ channels allows for a constant outflow of positively charged potassium ions (K+), making the inside of the neuron more negative relative to the outside.

What creates the resting membrane potential?

The movement of ions across the neuronal membrane through these channels.

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What is the resting membrane potential?

The membrane potential is a difference in electrical charge across the cell membrane, determined by the relative concentrations of ions inside and outside the neuron.

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