Which of the Following Terms Is Not Used to Define

question 27

Multiple Choice

Which of the following terms is not used to define the structure that separates the contents of a human cell from its surrounding medium?

• A) cell wall
• B) cell membrane
• C) plasma membrane
• D) organic membrane
• E) All of the above are used for the definition given.

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Definitions:

Axon

An extended, slim part of a nerve cell, also known as a neuron, that usually carries electrical currents away from the main cell body of the neuron.

Myelin

A fatty substance that surrounds and insulates the axons of some neurons, enhancing the speed and efficiency of electrical signal transmission.

Refractory Periods

Periods immediately following an action potential during which a neuron is unable to fire another action potential or the firing rate is significantly reduced.

Calcium Channels

Ion channels in cell membranes that allow the movement of calcium ions into or out of a cell, playing key roles in various physiological processes.