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Enzymes and the digestive 
system 
Objective: To understand the structure and 
function of the major parts of the digestiv...
The Digestive 
Mouth (containing System 
salivary glands) 
Liver 
Oesophagus 
(Gullet) 
Stomach 
Pancreas 
Large 
intestin...
Organ Function 
Churns up food with hydrochloric acid. 
Undigested food passes along here and water is 
reabsorbed. 
Makes...
The alimentary canal along with a range of organs and glands (produce 
enzymes) make up the digestive system. 
Function? 
...
The mouth 
Physical digestion of food by the 
teeth and tongue, forming a 
bolus. 
Salivary glands secrete saliva: 
~ wate...
The oesophagus 
A muscular tube connecting 
the mouth to the stomach. 
Peristalsis 
No digestion occurs here. 
Mouth 
Oeso...
The stomach 
Physical digestion occurs due to 
muscles in the stomach which 
churns the food forming chyme. 
Gastric gland...
The pancreas Large gland which secretes pancreatic 
juice. 
This contains enzymes including lipase, 
protease and amylase....
The small intestine Long muscular tube (6.5m) 
~ Duodenum: Further digestion 
takes place here due to enzymes 
secreted by...
The large intestine 
Where most water is 
reabsorbed. 
Food becomes drier forming 
faeces. 
Stored in the rectum and 
rele...
Chemical digestion 
Chemical digestion is... 
Physical digestion V s. 
List 2 places where 
this type of 
digestion occurs...
Digestive System: Recap Digestive System: Recap 
Organ Function 
Churns up food with hydrochloric acid. 
Undigested food p...
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AS-U1-2.1-Enzymes and the digestive system

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AS-U1-2.1-Enzymes and the digestive system

  1. 1. Enzymes and the digestive system Objective: To understand the structure and function of the major parts of the digestive system. Outcomes: ~ Identify the structures found in the digestive system and describe their function. ~ Explain how both physical and chemical processes are involved in digestion. ~ Explain the role of enzymes in the digestive system. Sunday, 28 September 2014 Keywords Enzymes Digestion Absorption Egestion Assimilation Carbohydrases Lipases Proteases Hydrolysis
  2. 2. The Digestive Mouth (containing System salivary glands) Liver Oesophagus (Gullet) Stomach Pancreas Large intestine Gall bladder Small intestine Rectum Anus
  3. 3. Organ Function Churns up food with hydrochloric acid. Undigested food passes along here and water is reabsorbed. Makes bile which is then stored in the gall bladder. Digested food is absorbed into the blood here. Makes enzymes. Squeezes food towards the stomach. Breaks food into smaller pieces.
  4. 4. The alimentary canal along with a range of organs and glands (produce enzymes) make up the digestive system. Function? To break down large insoluble molecules of food into smaller soluble ones. ~ Physical digestion ~ Chemical digestion (enzymes) e.g. carbohydrate  glucose Peristalsis Involuntary waves of muscular contraction
  5. 5. The mouth Physical digestion of food by the teeth and tongue, forming a bolus. Salivary glands secrete saliva: ~ water-dissolves any soluble substances ~ mucus-lubrication ~ lysozymes- kill bacteria ~ amylase-digests starch into maltose (chemical digestion)
  6. 6. The oesophagus A muscular tube connecting the mouth to the stomach. Peristalsis No digestion occurs here. Mouth Oesophagus Trachea Lungs Stomach Thick muscular wall
  7. 7. The stomach Physical digestion occurs due to muscles in the stomach which churns the food forming chyme. Gastric glands secrete gastric juice: ~ Enzymes (proteases) provide chemical digestion. ~ HCl acid (pH1) to kill bacteria. ~ Mucus to prevent the stomach from being digested.
  8. 8. The pancreas Large gland which secretes pancreatic juice. This contains enzymes including lipase, protease and amylase. Stomach Pancreas Gall bladder Duct Duct Small intestine
  9. 9. The small intestine Long muscular tube (6.5m) ~ Duodenum: Further digestion takes place here due to enzymes secreted by the intestine walls and from pancreatic juice. Bile is also secreted here via the liver, which emulsifies fats and neutralises stomach acid. ~ Jejunum: Digestion and absorption. Surface area is increased due to villi and microvilli. ~ Ileum: Final digestion and absorption.
  10. 10. The large intestine Where most water is reabsorbed. Food becomes drier forming faeces. Stored in the rectum and released via the anus, egestion. Transverse colon Ascending colon Descending colon Rectum Appendix Anus
  11. 11. Chemical digestion Chemical digestion is... Physical digestion V s. List 2 places where this type of digestion occurs. Large molecule? Small molecule? Group of enzymes involved? Carbohydrates Proteins Fats Hydrolysis is... Copy and complete the table below. Following digestion small molecules are... Describe the importance of this type of digestion.
  12. 12. Digestive System: Recap Digestive System: Recap Organ Function Churns up food with hydrochloric acid. Undigested food passes along here and water is reabsorbed. Makes bile which is then stored in the gall bladder. Digested food is absorbed into the blood here. Makes enzymes. Squeezes food towards the stomach. Breaks food into smaller pieces. Organ Function Churns up food with hydrochloric acid. Undigested food passes along here and water is reabsorbed. Makes bile which is then stored in the gall bladder. Digested food is absorbed into the blood here. Makes enzymes. Squeezes food towards the stomach. Breaks food into smaller pieces.

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