際際滷

際際滷Share a Scribd company logo

Animal digestive system

Download as PPT, PDF
A
animalcareplc2012

The digestive system has three main functions: 1. Mechanical breakdown of food through teeth, stomach contractions, and peristalsis. 2. Chemical digestion of food through enzymes in saliva, gastric juice, bile, and pancreatic juice. 3. Absorption of digested nutrients in the small intestine and colon.

1 of 20
Downloaded 452 times
Animal Digestive System
3 main groups Herbivore Plants only Carnivore Meat only Omnivore Both plants and meat
The Digestive System
Mechanical breakdown of food 1. Teeth 2. Contractions in stomach wall 3. Peristalsis Rhythmic muscular contraction and relaxation in the wall of the alimentary canal causing the food to move along the canal
Animal Teeth Incisors Cutting Canines Tearing Pre molars Crushing and grinding Molars
Oesophagus A muscular tube Connects Pharynx to stomach Food moves down the Oesophagus by Peristalsis
Stomach J shaped muscular bag Stores food for about 4 hours Churns and mixes food with gastric juice forming Chyme Digest food
Digestion in the Stomach 1. Mechanical Digestion Peristalsis physically breaks up food particles 2. Chemical Digestion using Gastric Juice containing a. Mucus b. HCl c. Pepsinogen
Small Intestine Muscular tube Functions Digestion Absorption Has three parts 1. duodenum 2. jejunum 3. ileum
Villi Infolding in the lining of the small intestine Function Increase surface area for absorption of digested food
Large Intestine Colon Caecum Appendix Rectum Anus
Large Intestine Functions (Colon) 1. Reabsorb water 2. Produce B group vitamins 3. Digest cellulose
Large Intestine Functions Caecum Appendix Function unknown in humans Rectum Stores Faeces
Role of the Liver in digestion The liver produces bile Bile is a yellow-green liquid Bile is stored in the gall bladder Bile enters the duodenum through the
Bile consists of 1. Water 2. Bile salts 3. Bile pigments Function of bile 1. Emulsifies fat This increases the surface area of the fat droplets 2. Neutralises the acidic chyme from stomach
Animal digestive system
At the mouth the large food molecules are taken into the gut - this is called ingestion. They must then be broken down into smaller ones by digestive enzymes digestion. they can then be taken from the gut into the blood stream - absorption. The cells of the body can then use these small molecules - assimilation. The indigestible waste products are eliminated from the body by the act of egestion.
Three enzymes involved in digestion Enzymes are biological catalysts 1 Amylase 2 Pepsin 3 Lipase
Common Ailments of the Digestive system Constipation Failure to pass faeces Caused by dehydration, poor fibre in diet Improve fibre in diet to treat Diarrhoea Passing abnormal amount of faeces (usually watery) Caused by infection, stress, colitis Withhold food and treat with medicine Pancreatitis Inflammation of the pancreas Caused by viral infection Withhold food for 72h and introduce low-fat diet, fluid therapy and antibiotics
End

More Related Content

Animal digestive system

  • 2. 3 main groups Herbivore Plants only Carnivore Meat only Omnivore Both plants and meat
  • 4. Mechanical breakdown of food 1. Teeth 2. Contractions in stomach wall 3. Peristalsis Rhythmic muscular contraction and relaxation in the wall of the alimentary canal causing the food to move along the canal
  • 5. Animal Teeth Incisors Cutting Canines Tearing Pre molars Crushing and grinding Molars
  • 6. Oesophagus A muscular tube Connects Pharynx to stomach Food moves down the Oesophagus by Peristalsis
  • 7. Stomach J shaped muscular bag Stores food for about 4 hours Churns and mixes food with gastric juice forming Chyme Digest food
  • 8. Digestion in the Stomach 1. Mechanical Digestion Peristalsis physically breaks up food particles 2. Chemical Digestion using Gastric Juice containing a. Mucus b. HCl c. Pepsinogen
  • 9. Small Intestine Muscular tube Functions Digestion Absorption Has three parts 1. duodenum 2. jejunum 3. ileum
  • 10. Villi Infolding in the lining of the small intestine Function Increase surface area for absorption of digested food
  • 11. Large Intestine Colon Caecum Appendix Rectum Anus
  • 12. Large Intestine Functions (Colon) 1. Reabsorb water 2. Produce B group vitamins 3. Digest cellulose
  • 14. Role of the Liver in digestion The liver produces bile Bile is a yellow-green liquid Bile is stored in the gall bladder Bile enters the duodenum through the
  • 15. Bile consists of 1. Water 2. Bile salts 3. Bile pigments Function of bile 1. Emulsifies fat This increases the surface area of the fat droplets 2. Neutralises the acidic chyme from stomach
  • 17. At the mouth the large food molecules are taken into the gut - this is called ingestion. They must then be broken down into smaller ones by digestive enzymes digestion. they can then be taken from the gut into the blood stream - absorption. The cells of the body can then use these small molecules - assimilation. The indigestible waste products are eliminated from the body by the act of egestion.
  • 18. Three enzymes involved in digestion Enzymes are biological catalysts 1 Amylase 2 Pepsin 3 Lipase
  • 19. Common Ailments of the Digestive system Constipation Failure to pass faeces Caused by dehydration, poor fibre in diet Improve fibre in diet to treat Diarrhoea Passing abnormal amount of faeces (usually watery) Caused by infection, stress, colitis Withhold food and treat with medicine Pancreatitis Inflammation of the pancreas Caused by viral infection Withhold food for 72h and introduce low-fat diet, fluid therapy and antibiotics
  • 20. End