An Action Potential in Muscle Is Caused by _______

question 38

Multiple Choice

An action potential in muscle is caused by _______.

• A) repolarization of the axon
• B) acetylcholinesterase in the synapse
• C) release of stored calcium
• D) a change in the distribution of electric charge across the membrane of the muscle fiber

---

Definitions:

Cyanobacteria

Photosynthetic bacteria that are often found in aquatic environments, capable of producing oxygen through the process of photosynthesis.

Aerobic Respiration

The process of producing cellular energy involving oxygen. It's the way most cells generate ATP, with carbon dioxide and water as byproducts.

Ozone Layer

A protective layer in Earth's stratosphere that absorbs most of the Sun's ultraviolet radiation, shielding the planet from harmful UV light.

Cyanobacteria

A phylum of bacteria that obtain their energy through photosynthesis and are noted for their role in the oxygenation of the Earth's atmosphere.