The Opening of More and More Na+ Ion Channels During

question 65

Multiple Choice

The opening of more and more Na+ ion channels during depolarization

• A)is the result of the sodium-potassium exchange pump.
• B)is an example of a positive feedback cycle.
• C)is possible only if K+ channels remain closed.
• D)is the cause of the afterpotential.
• E)is an example of a negative feedback cycle.

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Definitions:

Scraping

the process of removing material from a surface using a hard edge or object.

Gouging

The process of making grooves or marks in a surface, often related to glacial activity in geological contexts.

Cirque

An open-sided, bowl-shaped depression formed in a mountain, commonly at the head of a glacial valley; produced by erosion of a glacier.

Depression

A geological formation resulting from the sinking of the Earth's surface, forming a bowl-like or flat area lower than the surrounding ground.