An Action Potential Has Just Sped Down One of Your

question 57

Multiple Choice

An action potential has just sped down one of your motor neurons to jerk your hand off the hot stove. Before an action potential will speed through this neuron again, the membrane of the neuron must become repolarized. The time between the action potentials is called the __________ period.

• A)refractory
• B)polarization
• C)self-propagating
• D)repolarization

---

Definitions:

Individual Variation

Differences in characteristics such as traits, behaviors, or genetics among members of a single species or population.

Operational Sex Ratio

The ratio of sexually active males to receptive females in a population at any given time, affecting mating behavior and strategy.

Two-Fold Cost of Sex

A hypothesis in evolutionary biology that suggests sexual reproduction is twice as costly as asexual reproduction, since only females contribute to the gene pool of the offspring.

Sexual Lineages

The genetic line of descent traced through mating and reproduction, typically examined through the analysis of patterns in genetic variation.