Which Substance Is Released by Motor Neurons to Stimulate a Contraction

question 4

Multiple Choice

Which substance is released by motor neurons to stimulate a contraction?

• A) myosin
• B) acetylcholine
• C) dopamine
• D) calcium

---

Definitions:

Secretes

The process by which cells or glands release substances, such as hormones or enzymes, either into the bloodstream or into cavities inside the body or its outer surface.

Inflammation

A biological response to harmful stimuli (e.g., pathogens, damaged cells), characterized by redness, swelling, heat, pain, and sometimes loss of function.

Phagocytic White Blood Cells

White blood cells that protect the body by ingesting harmful foreign particles, bacteria, and dead or dying cells.

Blood Vessels Dilate

The widening of blood vessels, which decreases blood pressure and allows for increased blood flow to different parts of the body.