GCSE Biology

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GCSE Biology
2012-04-22 06:52:31
healthy bodies

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  1. define metabolic rate
    the rate at which chemical reactions in the cells of the body take place
  2. a top athelete needs to eat a lot of food each day . this includes protein and carbohydrate explain how these atheletes can put on so much weight without putting on weight
    the athelete burn off the proteins and carbohydrates as they contain energy
  3. what is obesity
    besity is when you take in more energy than you use and the excess is stored as fat . if your BMI is over 30 you are said to be obese
  4. suggest ways in which a person could lose weight
    they could excersie reguarly for a longer period of time and try to eat a balanced diet containg less processed food
  5. hoe do following a slimming diet and anorexia differ
    anorexia is a mental disorder which causes you not to eat whereas a slimming diet is where you are stilll eating food but eating a more balanced diet
  6. wht is the link between a high fat diet , raised blood cholestrol and the LDL/HDL balance in your blood
    if you have a high fat diet , where your are eating lots of saturated fat , this will increase your blood cholestrol levels and it will mean you have a greater numbe rof LDL's than HDL's
  7. why are doctors concerned if a patient has raised cholestrol levels or a high ratio of LDL's to HDL's
    because LDL's are knoen as bad cholestrol and clog up your arteries and cause heart disease so we need less of theses . HDL's however reudce the risk of heart disease as the transport excess LDL's to the live to be removed from the body
  8. fast food is often linked to an unhealthy lifestyle . explain the problems with fast foods - and why people still eat them
    people eat fast food (processed food) because it is quick and easy . However these fods conatin huge amounts of fat and salt . If you itnake too much salt it can cause high blood pressure which can damage your heart and kidneys which may lead to a stroke
  9. which organ in the body produces cholesterol
  10. which organ in the body may be damaged by high levels or cholesterol in the blood
    • heart
    • or
    • blood vessels
  11. name one other factor , other than diet , whic affects the level of cholesterol in the blood
    our balance between HDL's and LDL's
  12. other than increasing fitness , give two reasons why regular exercise is important in maiantaning a healthy body
    • decreases blood pressure
    • lowers risk of diabetes
    • lowers reisk of heart disease
    • it means yor body is burning off the energy , so less is stored as fat which could clog up your arteries
  13. what are LDL's and why can they be a problem
    • they are low density lipoproteins
    • and high levels of LDL's can increase the risk of you developing heart probolems because they clog up your arteries
  14. what are HDL's and how can they be useful
    • they are high density lipoproteins
    • they are useful because they transport excess LDL's back to the liver to be removed from the body , meaning you are less likely to develop heart disease as your arteries are less likely to be cloged up
  15. how do saturated fats affect the blood
    they increase you LDL blood cholestrol levels
  16. which foods contain staurated fats
    • animal fats
    • cheese
    • butter
  17. what are minerals used for
    growtha and repair of damaged tissues or cells
  18. what is difficeincy disease
    a disease where you lack a certain type of vitamin or mineral
  19. what affects your cholestrol level
    • inheritance
    • amount and type of fat in your diet