Human Body

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Author:
_Dani_
ID:
174930
Filename:
Human Body
Updated:
2012-10-02 01:28:44
Tags:
SCI
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Description:
The Human Body
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  1. Cells in our System
    • Specialised cells carry out specific functions in our bodies
    • Groups of similar cells make tissues
    • Groups of tissues form organs
    • Groups of organs make up our body
  2. Body System
    • Groups of organs working together to do a particular job in the body is called a body system
    • e.g. digestive system and nervus system
  3. Digestive System
    Mouth-Oesophagus-Stomach-Small Intestine-Large Intestine-Rectum-Anus
  4. Digestion
    When food is broken down into smaller substances which are absorbed into the blood. It then removes the waste that was not digested
  5. Amylase
    Breaks down starch into sugar in the mouth and small intestine
  6. Protease
    Breaks down proteins into amino acids in the stomach and small intestine
  7. Lipase
    Breaks down fats and oils into fatty acids and glycerol in the small intestines
  8. Mouth
    Digestion begins with teeth cutting and grinding food into smaller pieces
  9. Oesophagus
    Moves food down to stomach and is 25cm long
  10. Stomach
    J-shaped organ that churns the food mixed with gastric juices and is turned into chyme. Can hold up to 2L and is lined with mucus to protect from acids
  11. Liver
    Largest internal organ and is about 1.5kg producing chemicals for over 500 processes
  12. Duodenum
    It is the start of the small intsetines and where the pancrease, liver and bladder join the digestive track
  13. Small Intestine
    A 3-4cm wide and 4-6m long tube where waters and minerals are absorbed
  14. Large Intestine
    Lumps of faecus are stored and get expelled by the anus
  15. Anus
    A ring like muscle contracts and relaxes and opens when faecus are being expelled
  16. Skeletal System
    • System of bones that: protects vital organs
    • Supports the body
    • Allow movement with joints
  17. Skull
    Protects the brain with a solid casing which also houses most of the sense organs
  18. Ribcage
    Protects the lungs and heart in a cage and the ribs move to allow breathing
  19. Backbone
    Column of seperate bones called the vertebrae that support the body and protect the nerves of the spinal chord which run through the spinal chord
  20. Hips
    Form a strong base for the backbone and internal organs
  21. Limb Bones
    The long bones of the arms and legs that have many joints and allow plenty of movement
  22. Enzyme
    Special chemicals that speed up chemical reactions. Each has its own special shape and fits with one type of substance

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