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 epithelial tissue, determine the number of layers of cells (b).

Next, determine the shape of one of the cells that contains (e) and the dark-staining (d). Also, note the dark-staining thick line (a) that borders the lumen that is composed of numerous short extensions on the apical surface of each cell. These extensions serve to increase the surface area of this tissue that is in contact with the lumen.

Simple Columnar Epithelium

1. Microvilli (brush border)
2. Simple columnar epithelium (non-ciliated)
3. Mucus*
4. Nucleus
5. Cytoplasm
6. Plasma membrane
7. Secretion & absoption
8. Lining of gastrointestinal tract

*Type of cell: the arrow is pointing to a goblet cell (with mucus inside)