GCSE Biology

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GCSE Biology
2012-04-29 05:11:37
nerves hormones control body homeostasis

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  1. when we exercise how doe we lose water
    through respiration and sweat
  2. why does our seat sometimes taste salty
    because if we take in too much salt it is removed from the body with water
  3. why do sports drink manufacturers claim that these drinks will help your body recover faster than just drinking water
    because they conatin glucose , this will help to top up our bloode sugar levels so we have more energy , this helps because after sports our bodies respiration slows down and produce energy slowly . the drinks also contain chemicals that rehydrate our body by replacing salt that we have lost , this helps us to keep up the pace that we are creating energy
  4. why is there more water than glucose or salt in both the blood and urine
    because blood and urine are mostly made up of water
  5. why can our levels of glucose in the blood be so low
    because the glucose is either being used or stored
  6. why is the amount of salt given as chloride
    because salt contains sodium and chloride ions
  7. to stay healthy the body needs to balance the gain and loss of both water and ions . what organ controls the balance of water and ions in the body
  8. when is your body likely to be short of water
    after exercise
  9. what happens when your body contains too much water
    our kidneys produce urien which conatains the excesss salt and water which the body does not need
  10. a healthy human body stays at 37°C . why is it important to keep the body temperature at 37°C
    because this is the temperature our enzymes work best , at only a few degrees above or below normal body temperature and the reactions in your cells will stop and you will die
  11. for our body to work properly the conditions inside our body musst be kept constant . the process by which our body monitors and controls its internal environemnt is known as
  12. there are 4 conditions that need to be kept the same they are
    • our body temperature needs to be kept constant at 37°C
    • the amout of glucose in our blood
    • the amount of water in our blood
    • the amount of mineral ions in our blood
  13. there are also 2 posinous waste products that can cause problems if they build up in the body they are : (include where and when they are produced and how it is removed from the body)
    • carbon dioxide which is produced when cells carry out respiration . it is removed by the lungs
    • urea which is produced in the liver when excess amino acid are broken down . urea is filtered out of the blood by the kidney and removed from the body as urine
  14. contolling our sugar levels level
    our blood sugar level is controled by two hormones which are bothr produced by the pancreas . they are : (include their functions)
    • insulin and glucagon
    • insulin converts glucose to glycogen
    • glucagon converts glycogen to glucose
  15. what hormones does the pancreas produce and what is the effect of these hormones and which organ is the target organ
    • insulin
    • glucagon
    • to control the levels of glucose in our body
    • liver
  16. describe how hormones control the menstrual cycle
    • the master gland secretes FSH
    • an egg starts to mature in the ovary
    • FSH stumulates the ovary to secrete oestrogen
    • the lining of the uterus thickens and grows extra blood vessels
    • the lining of the uterus is ready for a fertalised egg
    • oestrogen levels rise
    • ovulation (an egg is released)
    • the pituitary stops secreting FSH
    • the ovary stops secreting oestrogen
    • inhibition of FSH secretion stops