An Action Potential at One Point Along a Neuron's Membrane

question 98

Multiple Choice

An action potential at one point along a neuron's membrane ends when _______.

• A) sodium channels open and sodium enters the neuron
• B) sodium channels open and sodium exits the neuron
• C) potassium channels open and potassium enters the neuron
• D) potassium channels open and potassium exits the neuron
• E) sodium channels close and sodium is pumped out of the neuron

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Definitions:

Great Plains

A broad expanse of flat land, much of it covered in prairie, steppe, and grassland, located in the central part of the United States.

Mississippi River

A major river in the United States, flowing over 2,300 miles from its source in Minnesota to the Gulf of Mexico, and playing a key role in the ecology, economy, and history of North America.

Earth's Concentric Zones

Refers to the internal layers of the Earth, which include the crust, mantle, outer core, and inner core, arranged from surface to center.

Mantle

The thick layer of rock between the Earth's crust and core, playing a key role in tectonic movement and heat transfer.