A cross (transverse) section of smooth muscle would most likely show which structural pattern?

A cross (transverse) section of smooth muscle would most likely show which structural pattern?

• A. Circular profiles
• B. Longitudinal fibers
• C. Striations
• D. Nerve bundles

Answer: (A)

Smooth muscle in hollow organs is organized in circular and longitudinal layers. When you inspect a cross (transverse) section, you’re cutting perpendicularly to the long axis, so the circular layer around the lumen is what you predominantly see. This produces ring‑like, circular profiles of cells in the section. Longitudinal fibers would be seen in a longitudinal cut, not transversely. Smooth muscle also lacks striations, since it doesn’t have the regular sarcomere bands that skeletal muscle shows. Nerve bundles may be present, but they don’t define the typical cross‑sectional pattern of circular rings. Thus, a transverse section of smooth muscle most clearly shows circular profiles.

Smooth muscle in hollow organs is organized in circular and longitudinal layers. When you inspect a cross (transverse) section, you’re cutting perpendicularly to the long axis, so the circular layer around the lumen is what you predominantly see. This produces ring‑like, circular profiles of cells in the section. Longitudinal fibers would be seen in a longitudinal cut, not transversely. Smooth muscle also lacks striations, since it doesn’t have the regular sarcomere bands that skeletal muscle shows. Nerve bundles may be present, but they don’t define the typical cross‑sectional pattern of circular rings. Thus, a transverse section of smooth muscle most clearly shows circular profiles.