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 ** 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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