The Rapid Depolarization Phase of a Pacemaker Cell Action Potential

question 7

Multiple Choice

The rapid depolarization phase of a pacemaker cell action potential is caused by movement of

• A) sodium and calcium through funny channels.
• B) calcium through T -type channels.
• C) sodium through funny channels.
• D) calcium through L -type channels.
• E) potassium through funny channels.

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Definitions:

Long-Run Supply Curve

A graphical representation that shows how the quantity of goods supplied by an industry changes over time in response to changes in price, assuming that all inputs can be varied.

Increasing-Cost Industry

An industry in which the costs of production increase as the industry's output expands, typically due to resource limitations or increased demand for inputs.

Slope

A measure of the steepness or incline of a line, representing the rate at which y-values change for each unit increase in x-values.

Pure Competition

A market structure characterized by a large number of small firms, identical products, and free entry and exit from the market.