Structure-Function.org

Since you have the luxuryLuxury? Yes, a luxury because, on a lab practicum, your instructor will expect you to figure out the primary tissue type on your own. of already knowing this is muscle tissue, give your attention to the layers of flattened, cylindrical cells, that lack striations and are not lining a passageway or chamber or covering an exposed surface.

Smooth muscle tissue

1. Longitudinal layer
2. Circular layer
3. Smooth muscle cell nucleus
4. Walls of uterus (myometrium)*
5. Contracts to propel substances**

*Other locations include: (1) walls of digestive, respiratory, & urinary tracts; (2) walls of blood vessels; or (3) iris

**Additionally: contraction of smooth muscle is also used to regulate the diameter of structures, such as in vasodilation or vasoconstriction.