Nutrition

Topics: Nutrition, Digestion, Small intestine Pages: 7 (2281 words) Published: October 23, 2013
The functions of the digestive system are to Digest, Absorb and Excrete. Please describe what this means. (P2)
Digest: Digest refers to the breaking down of food in a simple form so that the digestive system can use the substances found within the bolus of food, which the body needs to repair and grow. Absorb: Absorb is the suction of the nutrients found in the foods we eat. It is the taking on board the nutrients and the process of this is diffusion. Excrete: Excrete refers to the removal of waste. Formed by the food we have digested in order to do every day activities. It is the process of expelling waste from the body. Please describe the function of each of the following: (P2)

Buccal cavity – The buccal cavity is known as the mouth and the entrance of the digestive system. The buccal cavity is a voluntary action as we choice if we want to chew or shallow. The buccal cavity has many functions however its main function in the digestive system is to chemically break down the food we eat by using the saliva to break down the food in the simplest form . Also a function of the buccal cavity is to mechanically break down the food by using our teeth such as biting and chewing food into a simple form so it can be digested easily. The buccal cavity is a primary source. Before the food enters the stomach it is in the shape of a bolus. Oesophagus – The Oesophagus is the food pipe where the food chewed from the buccal cavity and then it enter the stomach. The oesophagus is a muscular tube that connects the pharynx to the stomach it carries the bolus of food that is chewed to the stomach along the tube. The function of oesophagus is to close of the end off and trap food in the stomach to allow digestion to happen. Stomach – The stomach is the food bag and it is where most stomach acids help to break down the food into waste as well as absorb the nutrients from the bolus of food. The stomach is a muscular bag. Stomach acids are amylase, lipase, hydrochloric acid and protase. These chemicals work together to digest the bolus of food. Duodenum – The duodenum is the first part of small intestine. It is C shaped and is long and curves around the pancreas. Pancreas – The pancreas is a large gland located just in front to the stomach. It is shaped like short, lumpy snake with its head connecting it to the duodenum. The pancreas secretes digestive enzymes into the small intestine to complete the chemical digestion of foods and absorption of nutrients. Liver – The liver’s primary function is to get rid of any toxins found in the body as well as within, that are consumed such as drugs and alcohol. The liver breaks the toxins down and produces bile so it is important because we use bile to break down fats. It is a rich source of vitamins A, D, E and M. Roughly the liver has 4 – 500 functions but this one is one of the main one especially in the digestive system. Gall bladder – The gall bladder stores bile produced from the liver and it releases the bile when it is needed to break down the fats when necessarily. Small intestine – The small intestine is long and thin tube basically like sausages and is approximately 10 feet long and is located just in front of the stomach and takes up most of the space in the abdominal cavity. Inside the small intestines the surface is full of many ridges and folds to allow the bolus of food to travel in it. These folds are used to maximize the digestion of food and absorption of nutrients. Large intestine – The large intestine is a long and thick tube however it is smaller than the small intestines so its approximately around 5 feet long. It is located just in front of the stomach and wraps around the small intestine. The large intestine absorbs water and contains many bacteria that can help to aid the process of breaking down the wastes to extract some small amounts of nutrients. Digestive juices – Digestive juices are referring to the chemical side of the digestive system. These are the...
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