After a Nerve Impulse, a Neuron Is Temporarily Less Likely

question 173

Multiple Choice

After a nerve impulse, a neuron is temporarily less likely to fire because

• A)the cell is still above its resting level.
• B)potassium ions flow out of the neuron while the ion channels are open.
• C)acetylcholine acts as an inhibitor.
• D)a positive after-potential has occurred.

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Definitions:

Infant

A very young child, especially one newly or recently born, usually considered to be from birth to 1 year old.

Zygote

A cell produced by the union of an ovum and a sperm.

Fetus

A developing human from roughly eight weeks after conception to the moment of birth.

Ovum

An egg, the female gamete or reproductive cell.