4. In order for your body to get energy the food
we eat must pass through the digestive
system
It is in charge of breaking down food into
small enough parts to be used by cells
5.
6.
7. Take the crackers you have in front of you
and chew them up well..BUT DO NOT
SWALLOW THEM!!!!
Hold them in your mouth for 5
minutes….starting….
Answer the questions as you go.
8. How did the crackers taste as you first
chewed them?
9. Describe how the taste changed as you
neared the 5-minute mark?
10. What do you think caused the any changes
you experienced?
11. Mechanical – the physical breakdown of food
into very small pieces
Chemical – breakdown of large particles into
smaller particles using ENZYMES.
12. The digestive system is merely a pathway
where food follows long tubes with a few
compartments
It starts at the mouth and finishes in the
rectum
13. This is the first stage of digestion that occurs
in this pathway
Mechanical digestion occurs with the chewing
of the food using teeth
Saliva in the mouth moistens food and adds
an enzyme called salivary amylase.
14.
15. When your food is fully chewed your tongue
pushes it to the back of your throat
Swallowing pushes the food down your throat
into your esophagus
The food is pushed towards your stomach by
wave-like movement called Peristalsis
They are caused by the contracting and relaxing of
muscle tissue around the esophagus
16.
17. Deals with the arriving food with a few
processes;
◦ The muscular stomach wall churns food back and
forth
◦ This mixes the food with the secretions from the
wall of the stomach, called GASTRIC JUICE
18. Gastric Juice is made up of
◦ Mucus
◦ Hydrochloric Acid
◦ Water
◦ Digestive Enzymes
19. The Hydrochloric Acid and enzymes help
chemically breakdown the larger particles
The mucus helps prevent the gastric juices
from digesting the stomach itself
The stomach slowly releases the food, which
is now a liquid, into the small intestines
20.
21. The average length of an adult human male is
about 22 feet 6 inches or 6.9 meters
In women it is 23 feet 4 inches or 7.1 meters
22. Chemical digestion continues in the small
intestines
The PANCREAS sends in more digestive
enzymes to further help the breakdown
The small intestines itself releases more
enzymes to assist the pancreas
23. Once the food has been broken up the small
intestines absorbs as much as it can
To catch as much as possible the intestines
use VILLI – finger like projections that absorb
nutrients
The absorbed nutrients go directly into the
blood stream
24.
25. The liver produces BILE
Bile is stored in the GALL BLADDER
The gall bladder sends bile into the small
intestines to assist in more chemical
digestion
26.
27. When food reaches large intestines
mechanical and chemical digestion is
complete
They absorb water, vitamins and minerals
Whatever is left forms into feces and is stored
in the rectum
