Question

explain how the structure of the epithelium and muscularis of the small intestine ,stomach and esophagus follow there function

Answer 1

The structure of the epithelium and muscularis of the stomach are described below:

The stomach has 3 major layers- the mucosa, submucosa and muscularis externa

1.The mucosa is formed of simple columnar epithelium that contains gastric glands, gastric pits and muscularis mucosa which is known as muscles that contract to expel the contents of gastric gastric glands. The cells in epithelium secretes HCl, mucus, pepsin and lipase.

2. The muscularis externa layer is composed of 2 to 3 layers of muscles in the different direction and helps to break up the food by peristaltic movement by means of its contraction.

The structure of the epithelium and muscularis of the small intestine are described below:

1. The epithelium of small intestine is composed of simple columnar epithelium which is formed by microvilli that increases the surface area of intestine to absorb the nutrients passing through it. Other kind of cells is present here to produce mucus that makes the chyle lubricating to protect the epithelium.

2. The muscularis externa layer is composed of 2 layers of smooth muscles which are inner circular and outer longitudinal layer that helps in the peristaltic movement of small intestine.

The structure of the epithelium and muscularis of the esophagus are described below:

1. The epithelium layer of esophagus is non keratinized stratified squamous that helps to prevent the entry of foreign particles inside it.

2. The muscularis externa layer is composed of 2 layers of smooth muscles which are inner circular and outer longitudinal layer with innervation between them. The first 1/3 of esophagus has striated voluntary muscles and the rest 2/3 of the esophagus has involuntary smooth muscles which plays role to move the food down to the stomach.