Mechanical and chemical digestion breaks down large food molecules into smaller nutrients. Mechanical digestion begins with chewing in the mouth and uses churning and peristalsis in the stomach and intestines. Chemical digestion involves enzymes that break down carbohydrates, proteins, and lipids at different stages. Carbohydrate digestion begins with amylase in the mouth and continues in the small intestine. Protein digestion starts with chewing and uses enzymes in the stomach and small intestine. Lipid digestion emulsifies fats in the small intestine using bile and enzymes to break them down and absorb the fatty acids.

1. Mechanical
&
Chemical Digestion
Course Code : MBIO 206
Presentation-01
Human
Physiology

2. Presented By
SENTHIA
AFROZ

3. Digestion
Digestion is how your body turns
into nutrients it uses
For energy,growth and cell repair.
The Digestive tract is a long
twisting tube that starts at mouth
and ends at anus.

4. There are Six Phases in
Digestion

5. The Digestion can be done by Following types-
Digestion
Mechanical Chemical
Carhohydrate
Peristalsis
Chewing
Proteins
Lipid
Segmentation
Churning
E
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Z
Y
M
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8. Mechanical/Physical Digestion
Is the physical breakdown act of food by non-chemical means.
Chewing:
The mechanical digestion
begins with chewing..The
food enters into the mouth
And starts break down the
Large molecules...

9. The Churning
action of stomach
muscle physically
breaks down the
food..
Churning

10. Peristalsis: Peristalsis is a wave like muscle contractions that
moves food to different processing stations in the digestive tract.The
process of peristalsis begins in the esophagus when a bolus of food is
swallowed..

11. Segmentation: Involves the contraction and relaxation of non-adjacent
segment of circular smooth muscle in the intestines.Segmentation contracts
move chyme in both directions,allowing for a greater of mixing of food with
digestive Juice.

13. Chemical Digestion :
Chemical digestion involves
the secretion of enzymes throughout your
digestive tract.The enzyme are break down the
chemical bonds that holds particle together.This
allows food to be broken down into small,digestive
tract..

15. The digestion of carbohydrates begins in the mouth. The salivary enzyme amylase begins the
breakdown of food starches into maltose, a disaccharide. The next step of carbohydrate
digestion takes place in the duodenum. The disaccharides are broken down into monosaccharides
by enzymes called maltases.,sucrases, and lactases, which are also present in the brush
border of the small intestinal wall. Maltase breaks down maltose into glucose.

16. CARBOHYDRAT
E DIGESTION

17. The
mechanical
and chemical
carbohydrate
begin from
the
mouth..Chemi
cal action of
Salivary
amylase..

18. DIGESTION OF
PROTEIN

19. Chemical Digestion of
Protein:
Protein digestion begins
when you first start
chewing.There are two
enzyme- Amylase and
Lipase. Proteins break
down fats.

20. The
Breakdown of
Proteins

21. Chemical
digestion of
Lipid

22. Lipid: In the stomach fat is separated from
other food substance.In the small intestine
bile emulsifies fats while enzyme digest
them.The intestinal cells absorb the
fats..Long-chaine fatty acids from a large
lipoprotein structure called a chylomicron
that transports fats through the lymph
system.