By: Che Kara, Jazmine, and Sascha

1
The Digestive System

• By Che Kara, Jazmine, and Sascha

2
(No Transcript)
3
How It Works

• The digestive system is a lot of hollow
  organs joined in a long twisted tubes from the
  mouth to the anus.
• Inside the tube there is a lining called the
  mucosa. In the mouth, stomach, and small
  intestine.
• The mucosa contains tiny glands that make juices
  to help digest our food.
• Two solid organs, the liver and the pancreas,
  make digestive juices that touch the intestine
  through the small tubes.

4
The Main Organs
5
The Mouth

• Mouth teeth take bites and chew food until its
  soft so that it is easy to swallow.
• Chewing food that is mixed with watery saliva
  from glands to make the face moist and slippery.

6
The Esophagus

• The esophagus or gullet is a muscle tube.
• It takes food from the throat and pushes it down
  to the neck and into your belly.
• The food moves by waves of muscle tightment
  called the peristalsis.

7
Stomach

• The belly has thick muscles.
• In its wall these contract to mash the food into
  a sloppy soup.
• The stomach lining makes strong digestive juices
  that attack the food in a chemical way of
  breaking down and dissolving nutrients.

8
Small Intestines

• The small intestine has a particular folded
  texture to increase the surface area available
  for diffusion of nutrients.
• Through the intestinal wall so they can be
  absorbed.
• These microscopic folds are called microvilli.
• In an older human body, the small intestine is
  about seven meters long.

9
Large Intestine

• The large intestine is about 1.5m long.
• It extends from the ileocecal junction to the
  anus.
• On the surface, you can see bands of longitudinal
  muscle fibers called taeniae coli. Each is about
  5mm wide.
• There is three bands and they start at the base
  of the appendix.

10
How Food Is Digested

• Digestion has mixing of food, its movement
  through the digestive tract and the chemicals
  break down food from big molecules to small
  molecules.
• Digestion starts in the mouth so when u chew and
  then swallow it goes into the small intestine.
• The chemical process is some what a different
  kind of food.

11
Letter C

• The excretory system removes water, wastes
  material and harmful substances from the body.
• This process is called excretion.
• The skin, lungs, kidneys and lower intestine are
  involved in the excretion.
• The digestive system processes nutrients and
  waste from the foods we eat and the liquids we
  drink.
• The stomach, mouth and intestine are parts of the
  digestive system.