An Action Potential Begins When

question 125

Multiple Choice

An action potential begins when

• A) sodium channels open.
• B) potassium channels open.
• C) both sodium and potassium channels open.
• D) sodium channels close.
• E) both sodium and potassium channels close.

---

Definitions:

Upper Coupler

The component at the front of a semi-trailer that connects to the fifth wheel of a truck tractor, transferring vertical and horizontal forces between the truck and trailer.

Natural Gas

A fossil fuel consisting mainly of methane, used as an energy source for heating, cooking, and electricity generation.

Domestically Sourced

Refers to products or materials that are obtained from within the country of manufacture, rather than imported.

Transit Bus

A type of bus designed for short-distance public transportation service, ferrying passengers through urban or suburban areas along designated routes.