When an Action Potential Reaches an Axon Terminal, Calcium

question 60

Multiple Choice

 When an action potential reaches an axon terminal, calcium

• A) rushes into the cell immediately, because this negatively charged ion is attracted to the now-positive environment of the axon terminal
• B) rushes out of the axon terminal, because this positively charged ion is repelled by the now-positive environment of the axon terminal.
• C) leaves the axon terminal as the action potential recedes, because that is when the calcium channels begin to open.
• D) enters the axon terminal as the action potential recedes, primarily due to diffusion.

---

Definitions:

Physical Arousal

The physiological state of being alert and engaged, often including increased heart rate, blood pressure, and sensory alertness.

Yerkes-Dodson Law

A psychological principle that suggests there is an optimal level of arousal for performance, and that too little or too much arousal can negatively affect task performance.

Stimulus Motives

Motives that cause humans and other animals to increase stimulation when the level of arousal is too low (examples are curiosity and the motive to explore).

Exploratory Motives

The drive behind individuals' desire to explore, investigate, and learn about their environment or new ideas.