The Stomach Is Bounded on Both Ends by a Sphincter

question 20

True/False

The stomach is bounded on both ends by a sphincter.

---

Definitions:

Actin-Myosin Cross-Bridges

The molecular interactions between actin and myosin filaments in muscle cells that lead to muscle contraction.

Sarcoplasmic Reticulum

A type of endoplasmic reticulum found in muscle cells, where it stores and releases calcium ions to trigger muscle contraction.

Acetylcholine

A neurotransmitter involved in many functions including muscle contraction, heart rate regulation, and the modulation of neuroplasticity in the brain.

Muscle Twitch

The brief contraction of a muscle fiber in response to a single stimulus.