Question

select all that apply

which of the following are types of smooth muscle tissue?

acetylcholine
multi-unit
intercalated discs
visceral

Explanation:

Identify smooth muscle classifications

Using the Visceral Smooth Muscle and Multiunit Smooth Muscle knowledge points

• Smooth muscle tissue is structurally and functionally classified into two main types:

1. Multi-unit smooth muscle: Consists of discrete, independent muscle fibers that contract individually (found in the irises of the eyes, large airways, and arrector pili muscles).
2. Visceral smooth muscle (also known as single-unit smooth muscle): Consists of sheets of electrically coupled cells that contract rhythmically as a single unit (found in the walls of hollow organs like the stomach, intestines, and uterus).

Evaluate incorrect options

• Acetylcholine: This is a neurotransmitter released at neuromuscular junctions, not a type of muscle tissue.
• Intercalated discs: These are specialized microscopic gap junctions found exclusively in cardiac muscle tissue, not smooth muscle tissue.

Answer:

• Acetylcholine
• Multi-unit (Correct answer)
• Intercalated discs
• Visceral (Correct answer)