The Human Digestive System

Oesophagus
1. Is a long muscular tube that starts at the mouth and ends at the stomach
2. Peristalsis
  1. Is the process of pushing food through the digestive track
Mechanical digestion
1. Food sliced,torn and crushed
2. Physical change because no new substance added
Chemical digestion
1. Large complex substances are broken down
  1. Food broken down into simpler chemicals by saliva
2. Saliva
  1. Watery liquid containing a chemical that begins the digestion of starch
Stomach
1. Food stored
  1. Muscle walls contract and relax
    1. Mixed with gastric juice
      1. Containing Hydrochloric acid,mucus,digestive juices
Mouth/teeth
1. Start of digestive system
  1. Teeth
    1. Premolar,molar,incisor,canine
Small intestine
1. Longest section of the digestion track
  1. Diameter is 3 cm
2. Duodenum
  1. First part of the small intestine
    1. Two tubes entering the duodenum carry chemicals
      1. Important digestion from the pancreas and liver
Large intestine
1. Final section of the digestion track
2. 1.5 meters long
  1. 6-7cm in diameter
    1. Water and nutrients absorbed into the body from the food
Liver
1. Largest internal organ
  1. Performs over 500 chemical processes
Pancreas
1. Produce pancreatic juice
  1. Containing chemicals that help digest fat,protein and carbohydrates

Resource summary

	Created by Marzia Azimi about 5 years ago