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Digestive system

Digestive system

DIGESTIVE SYSTEM

The digestive system consists of 1)mouth 2) pharynx 3)esophagus 4)stomach 5)small intestine 6)large intestine.it is one of the most important systems of our body, that helps to digest food.it is very important to know how the digestive system work.so let’s study the digestive system.

DIGESTION- Food must be broken down into mole that is small enough to enter body cells, a process known as digestion.

DIGESTIVE SYSTEM- The organ involved in the breakdown of food collectively called the digestive system.

GASTROENTEROLOGY- The medical specialty that deals with the structures, function, diagnosis, and treatment of disease of stomach and intestine is called gastroenterology.

OVERVIEW OF DIGESTIVE SYSTEM

Two groups of organs compose the digestive system.

1. The gastrointestinal tract

2.Accessory digestive organ.

1.GASTROINTESTINAL TRACT ALSO CALLED ALIMENTARY CANAL

GI is the continuous tube that extends from mouth to anus. through the thoracic and abdominopelvic activities.

ORGANS OF TH GASTROINTESTINAL TRACT

1)Mouth

2)Most of pharynx

3)Esophagus

4)Stomach

5)Small intestine

6)Large intestine

-The length of the gi tract is about 5-7 m in a living person.

THE ACCESSORY DIGESTIVE ORGAN.

The accessory digestive organ include,

1) Teeth

2)Tongue

3)Salivary gland

4)Liver

5)Gall bladder

6)Pancreas

THE DIGESTIVE SYSTEM PERFORMS SIX BASIC PROCESSES.

1.INGESTION; This process involves taking foods and liquids into the mouth.

2.SECRETION;   Each day, cells within the walls GI tract total of about 7 lit of water, acid, buffers, and enzymes into the lumen (interior space) of the tract.

3.MIXING AND PROPULSION; Alternating contraction and relaxation of smooth muscle in the wall of GI tract, mix food and secretions. and propel them towards the anus.

[This capability of the GI tract to mix and move material along its length is called MOTILITY]

4.DIGESTION- Mechanical and chemical processes break down ingested food into a small mole.

There are two types of digestion.

IN MECHANICAL DIGESTION;

IN CHEMICAL DIGESTION;

FUNCTION OF DIGESTIVE SYSTEM

  1. INGESTION; Taking food into the mouth.
  2. SECRETION; Release of water, acid, buffer, and enzyme into the lumen of the GI tract.
  3. MIXING AND PROPULSION; Churning and propulsion of food through the GI tract.
  4. DIGESTION; Mechanical and chemical breakdown of food.
  5. ABSORPTION; Passage of digested product from GI tract into the blood and lymphatic vessel and then circulate into cells.the entrance of ingested and secreted fluid, ions, and products of digestion into epithelial cell lining. the lumen of the GI tract is called absorption
  6. DEFECTION;  Elimination of feces from the GI tract. waste, indigested sub, bacterial cells remove from epithelial cells and leave the body through anus process called defection.

LAYERS OF GI TRACT

The wall of the GI tract from the lower esophagus to the anal canal has some basic. four-layer arrangement of tissue.

The 4 layers of tract from deep to superficial are;

  1. mucosa ; or mucus membrane

. 2) Location-in mouth, pharynx, esophagus, and anal canal.

3) These are mainly non keratinized stratified squamous epithelium that serves protection.

4)Simple columnar epithelium-which functions in secretion and absorption lines the stomach and intestine.

5) Epithelial cells are exocrine cells that secret mucus and fluid into the lumen tract and endocrines cells; collectively called enteroendocrine cells, which secrete hormones.

2.LAYER OF CONNECTIVE TISSUE /LAMINA PROPRIA.

3.THIN LAYER OF SMOOTH MUSCLE.

2.SUBMUCOSA LAYER

3.MUSCULARIS

4.SEROSA LAYER

THANK YOU.

URINARY SYSTEM

FOR MORE INFO ON THE DIGESTIVE SYSTEM

VISIT WIKIPEDIA

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