Post by Admin on Nov 21, 2016 11:44:55 GMT
Stages of Digestion
• The five stages of digestion are ingestion, digestion, absorbtion, assimilation and egestion.
• Ingestion is the taking of food into the mouth
• Digestion is the breaking down of food
• Absorbtion is the absorbtion of molecules of food into the blood in the small intestine
• Assimilation is the taking of food molecules from the blood into body cells.
• Egestion is the passing of undigested food out of the body.
• Physical digestion involves the chewing of food in the mouth and churning of food in the stomach.
• The four types of teeth are incisors, canines, premolars and molars.
• Chemical digestion is the breaking down of food by enzymes.
The Digestive System
• The digestive system is a group of organs working together to break down food and absorb the nutrients from it.
• The mouth chews food and mixes it with enzymes, eg. amylase in saliva.
• The oesophagus carries food to the stomach by muscular action (peristalsis).
• The stomach stores and churns food and mixes it with digestive juices. It also produces hydrochloric acid to kill bacteria.
• The liver produces bile to break down fats.
• The small intestine contains enzymes to break down food. Food molecules are absorbed into the blood in the small intestine.
• The pancreas produces enzymes.
• The large intestine passes water into the blood.
Enzymes
• An enzyme is a chemical which speeds up a chemical reaction in the body without being used up in the reaction.
• An enzyme acts on a substrate to produce the product.
• Amylase is an enzyme which breaks down starch (substrate) into maltose (product).
• The five stages of digestion are ingestion, digestion, absorbtion, assimilation and egestion.
• Ingestion is the taking of food into the mouth
• Digestion is the breaking down of food
• Absorbtion is the absorbtion of molecules of food into the blood in the small intestine
• Assimilation is the taking of food molecules from the blood into body cells.
• Egestion is the passing of undigested food out of the body.
• Physical digestion involves the chewing of food in the mouth and churning of food in the stomach.
• The four types of teeth are incisors, canines, premolars and molars.
• Chemical digestion is the breaking down of food by enzymes.
The Digestive System
• The digestive system is a group of organs working together to break down food and absorb the nutrients from it.
• The mouth chews food and mixes it with enzymes, eg. amylase in saliva.
• The oesophagus carries food to the stomach by muscular action (peristalsis).
• The stomach stores and churns food and mixes it with digestive juices. It also produces hydrochloric acid to kill bacteria.
• The liver produces bile to break down fats.
• The small intestine contains enzymes to break down food. Food molecules are absorbed into the blood in the small intestine.
• The pancreas produces enzymes.
• The large intestine passes water into the blood.
Enzymes
• An enzyme is a chemical which speeds up a chemical reaction in the body without being used up in the reaction.
• An enzyme acts on a substrate to produce the product.
• Amylase is an enzyme which breaks down starch (substrate) into maltose (product).