What are the 5 main parts of alimentary canal?

Answer 1

The two main parts of the digestive system are the mouth and the stomach. The mouth is where digestion begins and much of the food is broken down in the stomach.

Answer 2

Main Parts of Digestive System

The Mouth

This is the first among the parts of digestive system and also a very important organ of communication and respiration. The mouth is called the oral cavity. When food enters the mouth, it is broken into small bits and pieces by chewing. The saliva helps the food get softer and acts as a lubricant to help swallow. Saliva contains digestive enzymes which break the fats and some of the starch in the food we eat. The food that is broken, softened and swallowed is known as bolus. As the bolus enters the esophagus and then, the stomach, here is where the process of digestion starts.

The Esophagus

A 25 to 30 cm long muscular tube that connects the mouth and the stomach is known as the esophagus or esophagus. The esophagus is one of the main parts of the digestive system, as everything that we eat passes through this muscular pipe. It is commonly known as the food pipe. It is located in the throat between the stomach and the mouth. Food from the pharynx passes to the esophagus. Pharynx is situated right after the mouth in the neck. The normal function of the esophagus is to carry the bolus, other liquids and saliva from the mouth to the stomach, where the actual process of digestion begins. This transportation process that takes the solid food and liquids from the mouth to the stomach is automatic.

The Stomach

The stomach is 30.5 cm in length and 15.2 cm wide and hollow. The location of the stomach lies between the esophagus and the small intestine. The stomach is the main part of the digestive system and is divided into 4 parts, namely the cardia, where the bolus enters first; the fundus, which is the top curve of the stomach; corpus, that is the central part of the stomach and the pylorus, the lowermost part of the stomach from where food enters the small intestine. When the food enters the stomach, the enzymes and acids start breaking the food and turn it into semi-liquid form, which then pass into the small intestine.

The Liver

The liver weighs around 1.5 kg or more. It is the second largest organ in our body and located at the right side of the abdominal cavity behind the lower ribs. It is reddish-brown in color and the largest gland in the human body. The liver plays an important role in detoxification. Bile produced by the liver helps in the digestion and absorption of fats. It plays a pivotal role in the process of metabolism. It is very difficult to survive without a liver, as this is one of the important parts of the body, without which the body cannot function.

The Pancreas

The pancreas is about 6 in long and is located behind the stomach. It produces pancreatic juices and hormones, such as insulin, and enzymes, and helps to pass on the food to the small intestine. The pancreas help break down fats, carbohydrates and proteins, so that they can be used by the body. The pancreas also neutralize the acids in the stomach. It produces insulin, a hormone, and absorbs the sugar from the blood.pancreas help break down fats, carbohydrates and proteins. If enough insulin is not produced by the pancreas, a person can suffer from diabetes.

The Small Intestine

The small intestine measures between 6 to 7 m in length and 2.5 to 3 cm in diameter, and lies between the stomach and the large intestine. The small intestine is divided into three parts, namely, duodenum, the first section; jejunum or the mid part, and ileum, which is its lowermost part. In the small intestine, chemical digestion takes place. It protects the body against any infections, and secretes intestinal juices too. Food that is liquefied in the small intestine enters the large intestine, where absorption of water takes place.

The Large Intestine

The length of large intestine stretches up to 1.5 m long. It absorbs water and salts, and helps in the excretion of solid waste material. The waste or feces is in solid form, as the large intestine absorbs the water from the food. The large intestine maintains the fluid balance in our body. Some disorders of the large intestine are constipation, diverticulitis, diarrhea etc.

What Is the Function of the Digestive System?

The primary function of the digestive system is to break down the food we eat into smaller parts so the body can use them to build and nourish cells and provide energy.

The digestive system is a series of hollow organs joined in a long, twisting tube from the mouth to the anus. Inside this tube is a lining called the mucosa. In the mouth, stomach, and small intestine, the mucosa contains tiny glands that produce juices to help digest food.

Two solid organs, the liver and the pancreas, produce digestive juices that reach the intestine through small tubes. In addition, parts of other organ systems (for instance, nerves and blood vessels) play a major role in the digestive system.

When we eat things like bread, meat, and vegetables, they are not in a form the body can use as nourishment. Our food and drink must be changed into smaller molecules of nutrients before they can be absorbed into the blood and carried to cells throughout the body. Digestion is the process by which food and drink are broken down into their smallest parts so that the body can use them.

The digestive system is a series of hollow organs joined in a long, twisting tube from the mouth to the anus. Inside this tube is a lining called the mucosa. In the mouth, stomach, and small intestine, the mucosa contains tiny glands that produce juices to help digest food. There are also two solid digestive organs, the liver and the pancreas, which produce juices that reach the intestine through small tubes. In addition, parts of other organ systems (for instance, nerves and blood) play a major role in the digestive system.

Why Is Digestion Important?

When we eat such things as bread, meat, and vegetables, they are not in a form that the body can use as nourishment. Our food and drink must be changed into smaller molecules of nutrients before they can be absorbed into the blood and carried to cells throughout the body. Digestion is the process by which food and drink are broken down into their smallest parts so that the body can use them to build and nourish cells and to provide energy.

How Is Food Digested?

Digestion involves the mixing of food, its movement through the digestive tract, and chemical breakdown of the large molecules of food into smaller molecules. Digestion begins in the mouth, when we chew and swallow, and is completed in the small intestine. The chemical process varies somewhat for different kinds of food.

The large, hollow organs of the digestive system contain muscle that enables their walls to move. The movement of organ walls can propel food and liquid and also can mix the contents within each organ. Typical movement of the esophagus, stomach, and intestine is called peristalsis. The action of peristalsis looks like an ocean wave moving through the muscle. The muscle of the organ produces a narrowing and then propels the narrowed portion slowly down the length of the organ. These waves of narrowing push the food and fluid in front of them through each hollow organ.

The first major muscle movement occurs when food or liquid is swallowed. Although we are able to start swallowing by choice, once the swallow begins, it becomes involuntary and proceeds under the control of the nerves.

The esophagus is the organ into which the swallowed food is pushed. It connects the throat above with the stomach below. At the junction of the esophagus and stomach, there is a ringlike valve closing the passage between the two organs. However, as the food approaches the closed ring, the surrounding muscles relax and allow the food to pass.

The food then enters the stomach, which has three mechanical tasks to do. First, the stomach must store the swallowed food and liquid. This requires the muscle of the upper part of the stomach to relax and accept large volumes of swallowed material. The second job is to mix up the food, liquid, and digestive juice produced by the stomach. The lower part of the stomach mixes these materials by its muscle action. The third task of the stomach is to empty its contents slowly into the small intestine.

Several factors affect emptying of the stomach, including the nature of the food (mainly its fat and protein content) and the degree of muscle action of the emptying stomach and the next organ to receive the stomach contents (the small intestine). As the food is digested in the small intestine and dissolved into the juices from the pancreas, liver, and intestine, the contents of the intestine are mixed and pushed forward to allow further digestion.

Finally, all of the digested nutrients are absorbed through the intestinal walls. The waste products of this process include undigested parts of the food, known as fiber, and older cells that have been shed from the mucosa. These materials are propelled into the colon, where they remain, usually for a day or two, until the feces are expelled by a bowel movement.

By: Chica Sencilla Karla ♥

Answer 3

The digestive system is one of the major body systems in the human body. The parts of the system are the mouth, esophagus, stomach, liver, gallbladder, rectum, intestines, and pancreas.

Answer 4

The stomach,mouth,small intestines