In the colon, the muscularis externa is primarily composed of Blank 1 Question 17[select: , skeletal muscle, smooth muscle, dense connective tissue, lamina propria] , while the mucosal epithelium consists of Blank 2 Question 17[select: , stratified cuboidal, simple squamous, simple columnar, stratified squamous] cells.

Question

BlackTom AI · Accepted Answer

The colon has two different tissue layers being described here.

Blank 1: Options to consider are skeletal muscle, smooth muscle, dense connective tissue, and lamina propria.
- Skeletal muscle: incorrect for the muscularis externa in the colon, which is composed of smooth muscle arranged in an inner circular layer and an outer longitudinal layer, not skeletal muscle.
- Dense connective tissue: incorrect because the muscularis externa is muscular tissue, not connective tissue.
- Lamina propria: incorrect because this is a component of the mucosa (a connective tissue layer beneath the epithelium) and is not part of the muscularis externa.
- Smooth muscle: correct because the muscularis externa of the colon is made up of smooth muscle that provides peristaltic contractions and segmentation.

Blank 2: Options to consider are stratified cuboidal, simple squamous, simple columnar, and stratified squamous.
- Stratified cuboidal: incorrect as a type of epithelium; not typically present as the lining of the colon.
- Simple squamous: incorrect for the colon mucosa, which is adapted for absorption and secretion of nutrients and water; simple squamous is more typical of areas involved in diffusion (e.g., alveoli, endothelium) or protective surfaces, not the absorptive epithelium of the colon.
- Stratified squamous: incorrect because the colon mucosa is not lined by stratified squamous epithelium; that type is found in areas subject to abrasion (e.g., esophagus, vagina) but not governing the colon’s mucosal surface.
- Simple columnar: correct because the colon mucosa is lined by simple columnar epithelium (enterocytes) specialized for absorption, and goblet cells are interspersed to secrete mucus, which aligns with the colon’s function.

Together, Blank 1 should be filled with smooth muscle, and Blank 2 should be filled with simple columnar cells, reflecting the colon’s muscularis externa composition and mucosal epithelial lining.

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