Arrival of an Action Potential at a Presynaptic Cell's Axon

question 41

Short Answer

Arrival of an action potential at a presynaptic cell's axon terminals triggers the release of __________,a type of chemical signal.

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Definitions:

Bottleneck

A sudden decrease in a population size caused by adverse environmental factors; may result in genetic drift; also called genetic bottleneck or population bottleneck.

Directional Selection

A type of natural selection that favors one extreme phenotype over another, causing the allele frequency to shift in one direction.

Disruptive Selection

A form of natural selection where extreme values for a trait are favored over intermediate values, potentially leading to the evolution of distinct forms within a population.

Stabilizing Selection

A type of natural selection that favors the average individuals in a population, reducing variation around the mean phenotype.