The Gut of a Vertebrate Is Often Described as an Elongated

Multiple Choice

The gut of a vertebrate is often described as an elongated tube consisting of four layers of different cell types. Which of the following represents the correct order of those layers, from innermost (lumen-facing) to outermost?

A) Submucosa, cartilage, mucosa, endoplasmic reticulum
B) Smooth muscle layers, submucosa, mucosa, cartilage
C) Cartilage, smooth muscle layers, mucosa, circular muscle
D) Mucosa, submucosa, circular muscle, longitudinal muscle
E) Cartilage, mucosa, endoplasmic reticulum, submucosa