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Chapter 6 Nutrition in Humans Lesson 1 - The Need for Digestion

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Nutrition in Mammals
Lesson Objectives: ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Holozoic nutrition (feeding on ready made complex organic matter) ,[object Object],[object Object],[object Object]
Study tips: ,[object Object],[object Object],Picture the organ in your mind Identify the structures present Function of organ derived from structures present
Overview of the human digestive system Mouth ↓ Oesophagus ↓ Stomach ↓ Small Intestines ↓ Large Intestines ↓ Rectum ↓ Anus Mouth Stomach Small Intestine Pancreas Gall bladder Oesophagus
Types of digestion ,[object Object],[object Object],[object Object],[object Object]
Buccal Cavity (Mouth) ,[object Object],[object Object],[object Object],[object Object],amylase *mastication
 
Oesophagus ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],longitudinal muscle circular muscle (antagonistic)
serous coat - moist and slippery - layer of blood vessels & connective tissues - antagonistic smooth muscle sub-mucous coat mucous layer
Peristalsis ,[object Object],[object Object],[object Object],[object Object],[object Object]
*Peristalsis Muscles are antagonistic ( i.e. when one relaxes the other contracts and vice versa)
Stomach ,[object Object]
Stomach structure muscle contracts -> entrance to small intestine closes muscle relaxes -> entrance to small intestine opens
Gastric glands - produces mucus which coats the surface epithelium - produces pepsinogen - produces HCl
Gastric juice ,[object Object],[object Object],[object Object],soluble caseinogen insoluble casein rennin proteins polypeptides pepsin
Question to ponder: ,[object Object]
Inactive enzymes ,[object Object],[object Object],pepsinogen pepsin prorennin rennin HCl HCl
Small Intestine duodenum jejunum ileum
Pancreas, gall bladder & small intestine Cardiac sphincter Pyloric sphincter
Gall bladder ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Emulsification ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Pancreas ,[object Object],[object Object],[object Object],[object Object]
Pancreatic juice ,[object Object],[object Object],[object Object],[object Object],ALT
Intestinal juice ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],SME 2 LL polypeptides amino acids erepsin trypsinogen trypsin enterokinase proteins polypeptides trypsin
Summary: ,[object Object],[object Object],[object Object]

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Chapter 6 Nutrition in Humans Lesson 1 - The Need for Digestion

  • 2.
  • 3.
  • 4.
  • 5. Overview of the human digestive system Mouth ↓ Oesophagus ↓ Stomach ↓ Small Intestines ↓ Large Intestines ↓ Rectum ↓ Anus Mouth Stomach Small Intestine Pancreas Gall bladder Oesophagus
  • 6.
  • 7.
  • 8.  
  • 9.
  • 10. serous coat - moist and slippery - layer of blood vessels & connective tissues - antagonistic smooth muscle sub-mucous coat mucous layer
  • 11.
  • 12. *Peristalsis Muscles are antagonistic ( i.e. when one relaxes the other contracts and vice versa)
  • 13.
  • 14. Stomach structure muscle contracts -> entrance to small intestine closes muscle relaxes -> entrance to small intestine opens
  • 15. Gastric glands - produces mucus which coats the surface epithelium - produces pepsinogen - produces HCl
  • 16.
  • 17.
  • 18.
  • 19. Small Intestine duodenum jejunum ileum
  • 20. Pancreas, gall bladder & small intestine Cardiac sphincter Pyloric sphincter
  • 21.
  • 22.
  • 23.
  • 24.
  • 25.
  • 26.