Essay On The Digestive System

The Human Digestive System Essay

772 Words4 Pages

When we eat, the nutrients and energy we need in order to function have to be extracted from food and absorbed into the body. The process responsible for this is known as digestion. The human digestive system has to be able to process our omnivorous feeding habits and diet, and has adapted this to function at an optimum level and is controlled by our autonomic nervous system by the brain.
The digestive system is a collective of automated processes and organs, enzymes, secretions, some accessory organs and a pipework (or tube) that starts at the mouth and ends at the anus, known as the alimentary. The processes that take place along the alimentary canal are how we take in these various nutrients, differentiate what that body can use for…show more content…

When we eat, the nutrients and energy we need in order to function have to be extracted from food and absorbed into the body. The process responsible for this is known as digestion. The human digestive system has to be able to process our omnivorous feeding habits and diet, and has adapted this to function at an optimum level and is controlled by our autonomic nervous system by the brain.
The digestive system is a collective of automated processes and organs, enzymes, secretions, some accessory organs and a pipework (or tube) that starts at the mouth and ends at the anus, known as the alimentary. The processes that take place along the alimentary canal are how we take in these various nutrients, differentiate what that body can use for survival and function, and what it does not need or are surplus to requirements. This surplus food is passed through the alimentary canal at the opposite end and is excreted as waste.
The entire digestive process starts at the mouth. As we eat and take in food, the chewing action in the mouth uses the jaw, muscles and teeth to grind, mash and break up the solid food masses into smaller particles. Food is moistened by saliva, a secretion released from small ducts within the mouth. An enzyme within the composition of saliva called Amylase, works to dissolve some food particles and break down starchy foods, turning them into glucose. The advantage to this reduction in food size, all along the digestive tract, is to maximise surface area and make

Show More

The Digestive System Essay

Human Digestive System

Single-celled organisms can directly take in nutrients from their outside environment. Multi-cellular animals, with most of their cells removed from contact directly with the outside environment, have developed specialized structures for obtaining and breaking down their food.

The human digestive system is a complex series of organs and glands that processes food. It is a coiled, muscular tube (6-9 meters long when fully extended) extending 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. This tube also includes the pharynx, esophagus, large intestine, and anus.

The digestive system is responsible for converting the food we eat into energy for our bodies to use. In order to use the food we eat, our body has to break the food down into smaller molecules that it can process; it also has to excrete waste. In other words, the food we eat consists of large lumps of material. We must bite off small pieces and chew them up into even smaller ones before swallowing them.

There are two types of digestion: Mechanical and chemical. The teeth carry out mechanical digestion. There are 4 types of teeth:

Incisors: 8 front teeth 4 on the top and 4 on the bottom. Shaped for biting and cutting.

Canines: 4 teeth located on either side of the incisors. 2 on the top and 2 on the bottom. Shaped for tearing food.

Pre molars: ;8 located behind cuspids. 4 on the top and 4 on the bottom. Shaped for crushing food.

Molars: 8 - Double rooted teeth with bumpy chewing surfaces. 4 on the top and 4 on the bottom. Shaped for grinding food.

The Process of Digestion:

The process starts at the mouth. Food is partly broken down by the process of chewing and by the chemical action of salivary enzymes (these enzymes are produced by the salivary glands and break down starch into smaller molecules). The tongue helps to push the food down to the throat to the food.

The pushed food goes into the esophagus. The Esophagus connects the throat above with the stomach below. At the junction of the esophagus and stomach, there is a ring like 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. We can also swallow the food upside down because the muscles around the esophagus are strong enough to push the food up to our stomach.

The food then enters the stomach, a sack that receives the food from the esophagus. The stomach is located just below the heart. It has three mechanical tasks to do. First, the stomach stores the swallowed food and liquid. This requires the muscle of the upper part of the stomach to relax and accept large volumes of swallowed...

Loading: Checking Spelling

0%

Read more

The Digestive System of the Human Body

2086 words - 8 pages The digestive system is a very important system in the human body. It is a group of organs that work together to turn food into energy and nutrients in the entire body. The food that was chewed in a humans’ mouth now passes through a long tube that is inside of the body that is known as the alimentary canal. The alimentary canal is made of the oral cavity, pharynx, esophagus, stomach, small intestines, and large intestines. Those few things are...

This essay is about the digestive system organs and functions. It covers information about the path food travels.

712 words - 3 pages The digestive system is very important to the body. Without it, we would not be able to live. It is a series of hollow organs joined in a long, twisting tube from the mouth to the anus. The tubes actually are about 30 feet long if they were stretched out, but seem smaller because of the way they are wrapped around. The main parts are the mouth, teeth, esophagus, stomach,

quick assignment on the digestive system and how the different types of foods eg protein,carbohydrates ect are broken down in the body.

986 words - 4 pages Digestive System AssignmentIntroduction: Digestion is the process of breaking down food into smaller molecules that can be absorbed into the bloodstream.The digestive systems most important function is to provide the body with ENERGY. Other functions include:·Aid in the digestion and metabolism of food·Muscle...

Digestive System

1012 words - 4 pages Purpose The digestive system prepares food for use by hundreds of millions of body cells. Food when eaten cannot reach cells (because it cannot pass through the intestinal walls to the bloodstream and, if it could would not be in a useful chemical state. The gut modifies food physically and chemically and disposes of unusable waste. Physical and chemical modification (digestion) depends on exocrine and endocrine secretions and controlled...

Digestive system, Heartburn

555 words - 2 pages HeartburnHeartburn is the inflammation of the esophagus. It is also known as pyrosis. The major cause of heartburn is reflux. This is when the esophagus bottom edges are not tightly shut, and acid moves form the stomach up into the esophagus. Hiatus Hernia's also cause...

Functions In Digestion

556 words - 2 pages Summer 2014Function of The Human Digestive SystemThe digestive system is a group of organs that perform the process by which food, containing nutrients, is eaten and broken down into different components. This breakdown makes it possible for the digested material to pass through the intestinal wall into the blood stream....

Human Digestion Summary

516 words - 2 pages Human Digestion SummaryOur digestive system is made up of what is called the digestive tract. The digestive tract is made up of different hollow organs that are joined in a long, twisting tube that goes from the mouth all the way to the...

Probiotics and Prebiotics

975 words - 4 pages The digestive system is a compellation of organs that process foods consumed by humans. Our digestive system is made up of the stomach and intestines. These organs work simultaneously to break down food into smaller molecules so the body can extract nutrients and then turn it into waste. Since our digestive system constantly comes in contact with various foods, it also becomes an active site for growth of bacteria. Our digestive system contains...

describe the light reaction of photosynthesis

745 words - 3 pages BINDURA UNIVERSITY OF SCIENCE EDUCATIONFACULTY OF SCEINCE EDUCATIONDEPARTMENT OF BIOLOGICAL SCIENCESNAME : MAFASHU ELISHAREG NO. : B1437735PROGRAMME : DIPLOMA IN SCIENCE EDUCATIONCOURSE : BZ003 PLANT AND ANIMAL NUTRITIONACCADEMIC YEAR : PART 1.2...

The Horse’s Digestive Tract

1474 words - 6 pages The digestive system of the horse is a long and complex system that ensures that a horse gets enough nutrients to different parts of his body. It is also a very delicate system because of its size and complex nature. With all the different twists and turns that are involved in the process of digestion it is easy for this process to go wrong, which could cause a horse to experience extreme discomfort or even the loss of its life. The...

Problems Associated with Celiac Disease and Lactose Intolerance

1215 words - 5 pages Introduction: Enzymes are essential to the proper functioning of the human body. Enzymes are catalysts, which cause reactions to occur. The two primary classes of enzymes for maintaining life functions are digestive and metabolic enzymes. The primary digestive enzymes are classified as proteases, amylases and lipases. These enzymes can help breakdown food molecules. Metabolic enzymes are responsible for the repairing and structuring of every...

0 Replies to “Essay On The Digestive System”

Lascia un Commento

L'indirizzo email non verrà pubblicato. I campi obbligatori sono contrassegnati *