B2

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  • Cell organisation-B2.
    • Organs
      • Cells are the basic building blocks for all living things.
      • A tissue is a group of cells with the same structure and function.
      • Organs are groups of specific tissues performing certain jobs.
      • Organs are organised into organ systems which work together to form organisms.
    • Lock and key theory.
      • Chemical reactions usually involve things being joint together or split apart.
      • Every enzyme has an active site with a unique shape that fits onto the substance involved in the reaction.
    • A catalyst is a substance that speeds up a reaction but doesn't change it.
    • Enzymes.
      • Amylase- produced in the salivary glands in saliva. Breaks down starch.
      • Protease- produced in the pancreas. Break down proteins into amino acids.
      • Lipase- produced in the pancreas. Break down lipids to glycerol and fatty acids.
      • Carbohydrase- break down carbohydrates to simple sugars.
    • The heart and circulatory system.
      • The right ventricle pumps blood to the lungs where gas exchange takes place.
      • The left ventricle pumps blood around the rest of the body.
      • The body contains three types of blood vessel; arteries, veins and capillaries.
    • Communicable diseases can be spread from person to person by things like bacteria.
      • Non-communicable diseases cannot be spread by contact,e.g. asthma or cancer.
    • Cancer.
      • Cancer is caused by an uncontrolled cell growth and division.
      • Benign tumours are not dangerous but grow until there is no more room.
      • Smoking can cause lung, mouth, bowel, stomach and cervical cancer.
      • Obesity can cause bowel, liver and kidney cancer.
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