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The Digestive System - Cells, Tissues and Organs
Transcript of The Digestive System - Cells, Tissues and Organs
The digestive system is made up of the mouth, esophagus, stomach, small intestine, large intestine, liver, pancreas, gall bladder, rectum and anus.
All these organs are uniquely structured to perform the specialized function of converting food into energy.
Biological tissue is a collection of inter-connected cells that perform a similar function within an organism. The Stomach is mainly composed of the epithelial, muscular and connective tissue.
The Digestive System is a group of organs working together to convert food into energy and basic nutrients needed to support the body.
Location of Organs
The Muscular Tissue mixes stomach contents and forces contents towards the lower intestine.
Covers the inner and outer surfaces of the stomach to protect against acids. The epithelial tissue secretes digestive fluids, enzymes and acid. It acts as a leakage barrier and and an absorbing liner.
The connective tissues primary purpose in the stomach is to separate the mucosa from the smooth muscle layer of the stomach wall. Together with the epithelial tissue, it makes up the mucosa, which secretes gastric acid to aid in digestion. It also absorbs nutrients from the stomach.
Simple columnar epithelial cells in the Stomach
Simple columnar epithelial cells make up the columnar epithe are some of the most prolific cells in the body mainly because they can fullfil many functions. They are characterized by their height which is at least four times their width and are divided into simple (or unilayered), and stratified (oor multilayered).
The main function of simple epithelial cells is protection.
The simple columnar epithelial cell is made up of the microvili (increases the surface area of the cell), cytoplasm, nucleus, basal liminia (lines outer surfaces of cell membrane) and has loose connective tissue.