Ilham Husein

Explain the physiology of the body system
In this assignment am going to explain the physiology of three named body system in relation to energy metabolism in the body. Firstly am going to explain about metabolism and energy.
Metabolism is thousands of biological and chemical reactions to produce useful substances or to maintain life so Homeostasis reaction provides a suitable environment so metabolism can take place. Metabolism changes the nutrients from the food we eat into energy. Energy is required to give us power. Energy is the ability to do work which requires movement. The energy that the body produces is stored in ATP. ATP means Adenosine (protein manicure) Tri and Phosphate. However the ATP (three) can be used either as ADP (two) or MONO (one).
Enzymes are substance produced by living organs such as the mouth. Enzymes breaks food down for example carbohydrate is dissolved as sugar, fat dissolved as fatty acid and glycerol and protein dissolved as amino acid.
The three body system that I will be writing about in relation to energy metabolism is: the digestion, cardiovascular and respiratory system.
First am going to talk about the types of the digestion. There are two categorize of digestions: Mechanical and Chemical digestions. Mechanical digestion starts in the mouth and involves chewing and breaks the food into small particles. There are two categorize of Mechanical digestion: chewing which is the first step when the food down to digestion, digestion in fact starts sooner as food enters the mouth. Chewing starts the procedure of breaking down food into nutrients for example carbohydrate is broke down as sugar. Mechanical digestion, chewing is a significant part of the digestive procedure because smaller pieces are more gladly digested throughout chemical digestion. The chemical digestion starts in the mouth and the enzymes in the mouth breaks up carbohydrate into smaller molecules. The function of chemical digestion is the feature of digestion accomplish with the request of chemical top of food. Enzymes and water are in charge of breaking large molecules into small molecules like carbohydrate into smaller molecules so that they can be absorbable to be use by the cells.
The first system am going to write about is digestion system. As we know digestive system is very important because its use for energy and growth and repair cells. Digestion begins in the mouth as the teeth chop, tear and break the food down into small molecules so that it can go through oesophagus (tube that carries food to the stomach). Saliva is sprayed to soften and moisten the food. The chemicals in the mouth are called amylase in the salvia which breaks down carbohydrate and molecules. It then goes down to the oesophagus and makes its down to the stomach.
The stomach breaks down fat but not carbohydrate because the stomach has no enzymes that break down the carbohydrate. The carbohydrate then goes to the small intestine. The pancreas adds some chemicals such as amylase as the food leaves the stomach and goes down to the small intestine.
Then the small intestine which has three sections of tube and each part breaks the food down into smaller molecules so it can be small enough to absorb in the blood. One of the Enzymes that are found in the small intestine is pancreatic enzymes and reacts in the small intestine and its from the pancreas which converts carbohydrate into sugar. This pancreatic contains enzymes that complete digestion of starch called pancreatic amylase. The three parts of the small intestine are Duodenum, Jejunum and Ileum. Duodenum is the first part and the function of the Duodenum is to finish the first stage of digestion and it gets enough enzymes from the pancreas which breaks down the glucose by using amylase but yet the carbohydrate are not small enough to be absorb in the blood so its been pass to the second section of the small intestine which is the Jejunum, after the food has been broken down in