mechanical and chemical digestion

1. TWO TYPES OF DIGESTION

2. OBJECTIVE OF THE LESSON
1.Define digestion.
2. differentiate Mechanical
and Chemical digestion

3. TERMS TO KNOW:
1.DIGESTION- is the
process where food is
broken down by the
digestive system into
small nutrients to be
absorbed by the body.

4. TERMS TO KNOW:
2. NUTRIENTS- are very
tiny molecules that are
broken down from large
molecules to be
absorbed and used by
body cells.

5. Types of Nutrients
• Micronutrients- vitamins, minerals, & water
• Macronutrients- proteins, lipids, carbohydrates,
etc…

6. TWO TYPES OF DIGESTION
1.MECHANICAL DIGESTION- is the
process of changing physical form
of food.
2. CHEMICAL DIGESTION-is the
process of changing chemical
composition of food into a new
substances with the aid of
digestive enzymes.

9. Mechanical and Chemical Digestion in
the Parts of Digestive System
Mouth- takes place inside
the mouth mechanical
digestion where teeth and
tongue breakdown food by
chewing, tearing, grinding,
mashing, mixing and
crushing

10. Mechanical and Chemical Digestion in
the Parts of Digestive System
Mouth- the salivary
gland secrete mucus and
an enzyme called
amylase to breakdown
carbohydrates to simple
sugar, it is chemical
digestion.

11. Mechanical and Chemical Digestion in
the Parts of Digestive System
• Esophagus
The esophagus is a muscular
tube. As we swallow, we push
food along the tube until the
food reaches our stomach.
This process of pushing down
the food is called peristalsis

12. Mechanical and Chemical Digestion in
the Parts of Digestive System
Peristalsis: A type
of physical
(mechanical) digestion
in which food is
squeezed through
your digestive tract;
like from your
esophagus into your
stomach

13. Mechanical and Chemical Digestion in
the Parts of Digestive System
• Stomach
• The stomach mixes
the Food with
gastric juices called
pepsin to form
chyme. The
chemical digestion
of proteins begins
in the stomach.

14. Mechanical and Chemical Digestion in
the Parts of Digestive System
• Small Intestines
• Where fat molecules are
broken down into smaller
molecules. Which is an
example of chemical
digestion.
• The remaining food is pushed
down (peristalsis) to exit the
digestive system. Which is an
example of physical digestion.

15. Mechanical and Chemical Digestion in
the Parts of Digestive System
• Large Intestine
• Where excess water
is removed before
eliminating waste.
Which is an example
of physical digestion.

16. What type of digestion it is?
1.Chewing a Fish ball?
2.Saliva breaking the carbohydrates down
into molecules of glucose?
3.Fat molecules broken down into smaller
molecules in the small intestine?
4.Your tongue breaking pieces of a hamburger
apart?
5.Excess water being removed by the large
intestine?
6.Pepsin (an enzyme) in your stomach
breaking the hamburger into amino acids?
7.Peristalsis occurring in the esophagus?