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What are the main functions in digestion of thea) mouth b) stomachc) small intestine

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Introduction

The Digestive System What are the main functions in digestion of the a) mouth b) stomach c) small intestine The mouth takes in the food and uses the teeth and the salivary glands do break down the food so it could move onto the next phase. The teeth chew food while the salivary glands, liver, bile duct and pancreas produce digestive juices to break down food. The stomach is a L shaped, organ situated on the left side of the abdominal cavity beneath the diaphragm. At either end of this organ is a sphincter muscle which contracts and relaxes to control the movement of food in and out of he stomach. The stomach churns the food and releases gastric juices to help break it down. The gastric juices contain hydrochloric acid and enzymes such as pepsin. Hydrochloric acid kills any harmful bacteria and helps to dissolve the food. Pepsin begins the digestion of protein by breaking it down. Food can stay within the stomach for about 5 hours and leaves in a liquid form called chyme. ...read more.

Middle

The stomach uses hydrochloric acid and pepsin to help with the break down of food the stomach churns the food for the process of breaking down the food and then leaves the stomach in the form of chyme. This then enters the small intestine, this is where all the nutrients in the food are absorbed. Also in the digestive process the pancreas and the liver also play a part. The pancreas releases hormone in the body via the blood steam as well as that it also produces enzymes such as, Trysin- which digests proteins and breaks them down into amino acids, Amylase- which continues the digestion of starch, Lipase- which breaks down the fats into fatty acids and glycerol, The pancreas also keeps a check on the amount of glucose in the blood. If the levels of glucose are too high or too low, it produces hormones that stimulate the liver to adjust the balance. The liver has a number of functions such as, Storing and filtering blood, Secreting bile to help break down fat, Detoxification of harmful substances such ...read more.

Conclusion

Give three metabolic functions of the liver as part of the excretory system * Stored fat is broken down to provide energy. * Excess amino acids are broken down and converted into urea * Drugs and poisons are broken down * Antibodies and antitoxins are made What organs make up the urinary system? The urinary system are made up of the following organs, * The kidneys/renal organs * The ureter * The bladder * The urethra What is the difference between a male and female urethra? The male urethra is a common canal for the urinary system and reproductive system and is 18-20cms long. The female urethra. In the female it serves as the urinary system only and is 4cm long. What is the main function of the urinary system? The main function of the urinary system is to keep the body in homeostasis (balanced body). The system also helps to control the PH of the blood and regulate blood pressure. ...read more.

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