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 it easier and faster for our bodies to absorb the nutrients. Mucus also in saliva keep the mouth and upper digestive tract lubricated.
As we swallow food, it passes through the mouth and starts its journey down the pharynx and is worked down the oesophagus into...
... middle of paper ...
... of proteins, carbohydrates and fats. Villi also contain lymph nodes to help fight antigens ingested with food. As the chyme leaves the small intestines, it enters the large intestine at the cecum.
The large intestine is wider but considerably shorter in length to the small intestine. It is within the large intestine that the excess bile salts and water are removed to give the waste food a more dense consistency. Finally, the waste food passes through another sphincter and into the bowel where it must pass through a final sphincter before it leaves the body at the anus.
The entire process of digestion typically takes around three days but can be effected by bacteria, illness, disease and is totally automated. The brain controls the autonomic system to influence the involuntary contraction and relaxation of the muscles which make up the walls of the digestive tract.
Need Writing Help?
Get feedback on grammar, clarity, concision and logic instantly.Check your paper »
- Over the course of time there have been many pondering questions and theories about everyday life. Using Chemistry, the study of matter, those questions have been able to be answered. From the mixture of gases in the air we breathe to the organic substance of plastic, chemistry can be seen everywhere. However, most people misunderstand the power of chemistry in our own bodies. How is it that a simple loaf of bread, once consumed, can turn into fuel for the human body. Using the digestive system and its many organs through the process of digestion and metabolism is how our bodies receive the energy it needs to continue.... [tags: Biology, Esophagus, Stomach]
1350 words (3.9 pages)
- ... The advantage to this reduction in food size, all along the digestive tract, is to maximise surface area and make it easier and faster for our bodies to absorb the nutrients. Mucus also in saliva keep the mouth and upper digestive tract lubricated. As we swallow food, it passes through the mouth and starts its journey down the pharynx and is worked down the oesophagus into the stomach. A small flap of skin called the epiglottis prevents the food from entering our respiratory system by covering the entrance to the larynx, so the food has to travel down the oesophagus.... [tags: food, nutrients, pharynx, oesophagus]
776 words (2.2 pages)
- ... The food is then swallowed and the food travels the oesophagus to the stomach. While the food is in the stomach, enzymes and the stomach acid break it down into further smaller molecules. The digestive system also provides the cardiovascular system with nutrients and minerals. The cardiovascular system now absorbs the foods nutrients that have been broken down into smaller molecules to the blood. The nutrients that have been absorbed by the cardiovascular system circulated in your blood around the body.... [tags: blood, nutrients, oxygen]
612 words (1.7 pages)
- Your food goes through a lot before it is fully digested by your body. Your body must take in all of the nutrients from your food to benefit and affect your body. Pablo, Jimmy Bob, Akihuro, and Darius ate fully loaded nachos and beer while celebrating at a World Series Party. All the food they have eaten will go through the path of the digestive system, to the blood in the circulatory system, and in this case, the alcohol will affect the central nervous system. The digestion system's job is to break down food into small molecules to be absorbed by villi in the small intestine.... [tags: the human digestive system]
527 words (1.5 pages)
- ... The Process of the Digestive System This complicated process begins in the mouth as soon as you put the food in your mouth. Salivary amylase, which is found in saliva, starts the chemical digestion of starch by converting it from a polysaccharide to the disaccharide maltose. It functions best with a pH 6 or 7 which is slightly acidic. It then enters the pharynx and travels down the esophagus and into the stomach. The stomach is lined with strong muscular walls that contain millions of gastric glands.... [tags: foods, nutrients, waste]
1401 words (4 pages)
- The human digestive system is a bodily process made up of many systems, organs and substances that break down food both physically and chemically for use by the body. But what exactly is human digestion and what happens to food as it moves through the digestive system. “…[digestion] is a group of organs working together to convert food into energy and basic nutrients to feed the entire body” (Tim Taylor). There are three major bodily mechanisms that contribute to the process of digestion. The first mechanism is the breakdown of food, the second mechanism is the process of extracting nutrients from food, and the third mechanism is excretion, or the body’s natural waste system.... [tags: body, enzymes, organs]
1538 words (4.4 pages)
- Food is defined as a substance that can be metabolized by an organism to give energy and build tissue. The process of changing the food as the source of energy for human body is known as the digestive system. Digestive system is also important to take the food nutrient such as protein, vitamin, carbohydrate, minerals and so on. Human digestive system consists of two main digestion systems which are mechanical and chemical digestion. Human digestive system consists of seven crucial stages. The stages are mouth, pharynx and esophagus, stomach, small intestine, large intestine, rectum and lastly, rectum (refer to Figure 1 in Appendix 1).... [tags: Metabolism, Large Intestines]
1079 words (3.1 pages)
- ... Then after the horror of being mechanically digested by the teeth. By squirting through the salivary glands saliva drowns Banana with enzymes such as ptyalin breaking down his nutrients into easier absorbable nutrients by chemical digestion for the child. Next in the line of torture it has moved past the inclosed windpipe by the epiglottis to the esophagus a long tube of darkness lined with slippery mucus. The esophagus has been using the motion of peristalsis a wave of muscle contractions that are so strong it can be done in any position to transfer food to the sphincter that leads into the stomach.The Pancreas disperses these enzymes such as amylase.... [tags: banana, died, mouth, system]
846 words (2.4 pages)
- I. Introduction The human digestive system consists of organs from the gastrointestinal tract, which is a tube that goes from the mouth to the anus. Either end of the mouth and the anus contain a lumen, which is open on each side for the external environment. Everything inside the lumen is considered to be external to the body. The organs that make up the GI tract consist of the mouth, stomach, pharynx, esophagus, large intestine, small intestine, and the anus. The human digestive system also consists of other organs that help with digestion, such as the salivary glands, teeth, liver, tongue, gallbladder, and the pancreas(Allen, Harper 2009)..... [tags: mechanical and chemical digestion]
2786 words (8 pages)
- The human digestion system is very complex. It starts with the mouth, salivary glands, pharynx, esophagus, stomach, liver, pancreas, gallbladder, small intestine, large intestine, then ends/exits with the anus. Each step is essential to the whole system. For example, the mouth chews food and mixes it with saliva produced by the salivary glands, and then the pharynx swallows chewed food mixed with saliva, this is followed by the food traveling through the esophagus to the stomach where the food gets a bath and mixes with acids and enzymes.... [tags: food, nutrition, stomach]
600 words (1.7 pages)