Human Digestive System


Human Digestive System

Means of Digestion

Human Digestive System: Digestion is the method through which advanced natural materials are transformed into easy natural materials by water degradable enzymes.

Types of Digestion

There are Two Types of Digestion:

  1. Intracellular digestion
  2. Extracellular digestion

Intracellular digestion

When the method of digestion takes place contained in the cell, that is referred to as intracellular digestion. e.g. amoeba, paramecium, sponges, and many others.

Extracellular digestion

When the method of digestion takes place outdoors the cell, that is referred to as extracellular digestion. e.g. ennalida, mollsca, cordeta, and many others.

Human Digestive System

The digestive system of the human body includes a group of organs working collectively to transform food into energy for the body. The digestive system, (also referred to as the alimentary canal) is a collection of related organs main from the mouth to the anus. The meals we eat undergo a lot of processing earlier than the vitamins current in them are utilized to generate energy. This processing is called digestion. People and different animals have specialized organs and methods for digestion.

The digestive system is normally divided into eight components: the mouth, the esophagus, the abdomen, the small gut, and the massive gut with the liver, pancreas, and gallbladder including secretions to assist digestion. These organs mix to carry out six duties: ingestion, secretion, propulsion, digestion, absorption, and defecation.

Eight elements of the Digestive System are:


The digestive tract begins in the mouth. Digestion begins when food is taken into the mouth, ground up by the enamel, and moistened with saliva. Saliva has an enzyme referred to as amylase that begins to interrupt down carbohydrates into sugars. Actions of the tongue assist to push the moist, gentle mass of food to the again of the mouth the place it may be swallowed. A flap of pores and skin referred to as the epiglottis closes over the windpipe (trachea) to make sure that food is directed into the esophagus – the tube that results in the abdomen.


The esophagus delivers food to the abdomen. The esophagus is about 8 inches lengthy and is lined by moist pink tissue referred to as the mucosa. The esophagus runs behind the windpipe (trachea) and coronary heart, and in the entrance of the backbone. Simply earlier than coming into the abdomen, the esophagus passes by way of the diaphragm.


The abdomen is a muscular organ positioned on the left facet of the higher stomach. The abdomen receives meals from the esophagus. As food reach the top of the esophagus, it enters the abdomen by way of a muscular valve referred to as the decrease esophageal sphincter.

Small Intestine

The small intestine is about 20 toes lengthy and about an inch in diameter. The small gut is the longest part of the digestive system. The main capabilities of the small intestine are to finish the digestion of food and to soak up vitamins. The small intestine is split into the duodenum, jejunum, and ileum. Collectively these can lengthen as much as six meters in size. All three components are coated with the larger omentum anteriorly.

Large intestine

Your large intestine is about 5 toes (or 1.5 meters) lengthy. The large intestine is far broader than the small intestine and takes a lot straighter path by way of your stomach, or stomach. The aim of the massive intestine is to soak up water and salts from the fabric that has not been digested as food and eliminate any waste products left over.


The liver is a large, meaty organ that sits on the proper facet of the stomach. The liver’s weight is about 3 kilos. Usually, you’ll be able to’t really feel the liver, as a result of it is protected by the rib cage. The gallbladder sits below the liver, together with components of the pancreas and intestines. The liver and these organs work collectively to digest, take in, and course meals. The liver’s predominant job is to filter the blood coming from the digestive tract, before passing it to the remainder of the body. The liver additionally detoxifies chemical compounds and metabolizes medicine. The liver additionally makes proteins essential for blood clotting and different capabilities.


The pancreas is an organ positioned within the stomach. It performs a vital function in changing the food we eat into gasoline for the body’s cells. It’s spongy, about six to 10 inches lengthy, and is formed like a flat pear or a fish prolonged horizontally throughout the stomach. The pancreas has two predominant capabilities: an exocrine operate that helps in digestion and an endocrine operation that regulates blood sugar.

Gall Bladder

The gallbladder is a small pouch that sits just below the liver. The gallbladder stores bile produced by the liver. After food, the gallbladder is empty and flat, like a deflated balloon. Earlier than a meal, the gallbladder could also be stuffed with bile and concerning the measurement of a small pear.


The rectum is the final part of the large intestine and connects the sigmoid colon to the anal canal. It’s about 12 to 16 cm lengthy.

Why is digestion essential?

Digestion is essential for breaking down food into vitamins, which the body makes use of for vitality, development, and cell restore. Foods and drinks should be turned into smaller molecules of vitamins earlier than the blood absorbs them and carries them to cells all through the body. The body breaks down vitamins from food and drinks into carbohydrates, protein, fat, and nutritional vitamins.