The Signal That Crosses a Synapse Is Stopped When

question 27

Multiple Choice

The signal that crosses a synapse is stopped when

• A)the responding cell runs out of sodium and is no longer able to respond to the stimulus.
• B)the neurotransmitter is enzymatically broken down or transported back to the signaling cell.
• C)the responding cell runs out of potassium and is no longer able to respond to the stimulus.
• D)a second action potential traveling down the signaling cell sounds a "retreat" and the neurotransmitters return to the signaling cell

---

Definitions:

Desert Environment

A biome characterized by very little rainfall, extreme temperatures, and sparse vegetation, making it a challenging habitat for life.

Photosynthetic Mode

A method by which plants, algae, and some bacteria convert light energy into chemical energy stored in glucose.

CAM

A type of photosynthesis (Crassulacean Acid Metabolism) adapted by some plants to minimize water loss in arid conditions by fixing CO2 at night.

CAM Plants

Plants that utilize Crassulacean Acid Metabolism, a carbon fixation pathway that allows them to conserve water in arid conditions by opening their stomata at night.