b1 and b3 cont

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  • b1 and b3 cont
    • homeostatis
      • the rmo regltory sytem in the brain is what controls our bodys tempture
      • it can detect the tempture of blood flowingthrough the brain and from receptors in the skin
      • helps keep body at 37degrese cecius
      • tempture extremes are danger rouse too high and you can get heat stroke and dehyration even death
      • too cold and you could gethypothermia and can even lead to death
      • when you get cold your hands and feet feel it first this is beacuse your body works to keep its core body temputer
      • the body need energy from glucose this is coontroled by a horomonre called insulin
      • se the amount of glucose in the blood is controled by a hormone called insulin
      • diabites is when you cannt produce insulin or not engugh insulin so you have to carefuly montor your blod gloucose levels and take nsulin shots
      • type on diabetese is inherted
      • type two is often the result of a  poor deit and not enogugh exsize
    • veriation and inhertance
      • inherted caracterstics are controled by genes
      • diffrent forms of the same gene are called alleles
      • for exampel the gene for eye coulour has an lleale for blue eyes and brown eyes
      • alleael sae ethire dominate or resseive
      • so in order to have blue eyes you need to have two alleales for blue but if you had ablue and a brown alleale you would have brown eyes
      • gentic digrams are used to explain *** alleales work they use a big letter or the dominat and a small letter for the resesive
      • understanding how alleales work can help us undrestand gentic deseases
      • if you have a desase caused by resesive alleales and you have the alleale for it but do not suffer from it you are a carryer for it
      • you can be tested for these deaseses but it can raise difficult moral dilemas
      • the sex cromstome pair determens weather you are male or female if you get an XY combnation you are male but if you ge an XX combnation you will be female
      • you only get 23 cromsones from your mum and 23 from your dad makeing 23 pairs your sex cells agmetes only hve 23 singel chromzones
    • respration
      • energy needed for physical activty is realsed by a prosses called respration
      • during exsize demand for oxgen and glucose incresed
      • the body increses the heart rate and pulse rate
      • if the energy demand is not et than you will begin to anerobicly and arerobicly resprate
      • when you anerobicly reprate you get an oxgen dept and a build up of latic acid
        • after exsize an increased heart rate carrys away any latic acid to th liver and you pant heavly to pay off the oxgen dept
      • fit people can carry out exsize more efficently than unfit poeple and their pulse rate will return to normal much more quicly
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    • cell devision
      • dna is a doubel helix and has four bases G+C T+A
      • genes code for amino acids
      • mietosis is how living things grow this is how it works
        • first the pearents cells chrosomes make identical copys of them selfs
          • chromsones line up in the midel
            • the copys are split apart by spindels
              • the cell seprates into to daghter cells
                • some plants and animals reproduce this way
                  • this is called asextual reprodution
      • meiosis happens between sex cells
        • sexual reprodution through meiosis whne the 23 indvual cells join intruducees veration this is how it works
          • first all the chromsomes copy themselfs
            • then some dna is swiched between simlar pairs
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