Why is digestion necessary All animals require a supply of water,  oxygen, simple sugars, amino acids,fatty acids, vitamin...
• In nature these substances are available in the  form of• Proteins• Starches• Fats• Vitamins• Minerals.
• All of these substances need to be broken  down in to simple molecules so that they can  pass through cell membranes and...
•   These simple molecules are•   amino acids•   sugars•   fatty acids
Describe what happens to a mealhaving fats/CHO/Proteins whenits in stomach.
Digestion in stomach
Cardiac sphincter• It is a special ring of muscles at the junction of  oesophagus and stomach.
sphincter• sphincter• a circular band of voluntary or involuntary  muscle that encircles an orifice (opening) of  the body...
• When sphincter muscles contract , the  entrance to stomach closes and stops moving  back of stomach contents back into  ...
• This sphincter opens when a wave of  peristalsis comes down the food pipe.
• per·i·stal·sis• the progressive wave of contraction and  relaxation of a tubular muscular system
Location of stomach
Location of stomach• Stomach is situated on the left side of  abdomen under diaphragm
• (in direction or location) from front to back in  the median plane or in a plane parallel to the  median.
Stomach wall•   3 layers•   Outer layer of connective tissue•   Middle layer of smooth muscles•   Inner layer( mucosa) of ...
Middle layer• Outer longitudinal• Inner circular muscles• These muscle layers help in churning (mixing  ,tossing and turni...
Mucosa• It has various tubular gastric glands which are  composed of 3 kinds of cells.
Mucous cells• They secrete mucus• Mucous is thick secretion that covers the  inside of stomach and stops digestion of lini...
Parietal cells• Also called oxyntic cells• They secret HCl.• HCl is secreted in concentrated forms.• It adjusts the pH of ...
Zymogen cells• They secrete pepsinogen.• Pepsin is an enzyme.• Its inactive form is called pepsinogen.• Pepsinogen gets co...
Gastric juice• Secretions of all these cells is called gastric  juice.
Digestion of carbohydrates• In the Mouth  The process of digesting carbohydrates begins  in the mouth. Our saliva contains...
•   The secretion of gastric juice is regulated by•   1. smell•   2.sight•   3.quality
• Chyme finally goes to duodenum through  relaxed pyloric sphinter.
Why is digestion necessary
Why is digestion necessary
Why is digestion necessary
Why is digestion necessary
Why is digestion necessary
Upcoming SlideShare
Loading in...5
×

Why is digestion necessary

1,080

Published on

Published in: Technology, Business
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total Views
1,080
On Slideshare
0
From Embeds
0
Number of Embeds
0
Actions
Shares
0
Downloads
2
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

Transcript of "Why is digestion necessary"

  1. 1. Why is digestion necessary All animals require a supply of water, oxygen, simple sugars, amino acids,fatty acids, vitamins, other organic and inorganic molecules.
  2. 2. • In nature these substances are available in the form of• Proteins• Starches• Fats• Vitamins• Minerals.
  3. 3. • All of these substances need to be broken down in to simple molecules so that they can pass through cell membranes and are used by body.
  4. 4. • These simple molecules are• amino acids• sugars• fatty acids
  5. 5. Describe what happens to a mealhaving fats/CHO/Proteins whenits in stomach.
  6. 6. Digestion in stomach
  7. 7. Cardiac sphincter• It is a special ring of muscles at the junction of oesophagus and stomach.
  8. 8. sphincter• sphincter• a circular band of voluntary or involuntary muscle that encircles an orifice (opening) of the body or one of its hollow organs.
  9. 9. • When sphincter muscles contract , the entrance to stomach closes and stops moving back of stomach contents back into oesophagus (food pipe).
  10. 10. • This sphincter opens when a wave of peristalsis comes down the food pipe.
  11. 11. • per·i·stal·sis• the progressive wave of contraction and relaxation of a tubular muscular system
  12. 12. Location of stomach
  13. 13. Location of stomach• Stomach is situated on the left side of abdomen under diaphragm
  14. 14. • (in direction or location) from front to back in the median plane or in a plane parallel to the median.
  15. 15. Stomach wall• 3 layers• Outer layer of connective tissue• Middle layer of smooth muscles• Inner layer( mucosa) of connective tissue with many glands.
  16. 16. Middle layer• Outer longitudinal• Inner circular muscles• These muscle layers help in churning (mixing ,tossing and turning) and mixing of food with stomach secretions.• This mixture is called chyme
  17. 17. Mucosa• It has various tubular gastric glands which are composed of 3 kinds of cells.
  18. 18. Mucous cells• They secrete mucus• Mucous is thick secretion that covers the inside of stomach and stops digestion of lining of stomach wall
  19. 19. Parietal cells• Also called oxyntic cells• They secret HCl.• HCl is secreted in concentrated forms.• It adjusts the pH of stomach contents ranging from 2-3 so that pepsin can act on proteins.• It also makes food soft• It kills microorganism taken along with food
  20. 20. Zymogen cells• They secrete pepsinogen.• Pepsin is an enzyme.• Its inactive form is called pepsinogen.• Pepsinogen gets converted to pepsin only in acidic environment or after getting exposed to some already activated pepsin.• Pepsin hydrolyses protein to produce peptones and polypeptides.
  21. 21. Gastric juice• Secretions of all these cells is called gastric juice.
  22. 22. Digestion of carbohydrates• In the Mouth The process of digesting carbohydrates begins in the mouth. Our saliva contains an enzyme called amylase that starts breaking down the more complex carbs into simpler types.• In the Stomach Enzyme activity continues in the stomach, but slows down significantly as digestive acids are released into the stomach by the glands.
  23. 23. • The secretion of gastric juice is regulated by• 1. smell• 2.sight• 3.quality
  24. 24. • Chyme finally goes to duodenum through relaxed pyloric sphinter.
  1. A particular slide catching your eye?

    Clipping is a handy way to collect important slides you want to go back to later.

×