biolagy b1 and 3

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  • biolagy b1 and 3
    • enzymes
      • enzmes are bilogical catlists
        • amlases break down fattty acids
          • enzymes are a type of protine
        • they work useing an ative site wich breas own chemicals
          • they speed up chemiacal reactions in the body
            • exampels fo chemical reations enzmes help with are protine synsis and respration
      • enzymes have active sites that only a spersifc substrate will fit into
        • an enzmes active site will only work with one substrate this is kown as a lock and key mechnisum
          • enzymes work best at their otimum tempture
            • if you go over or under an enzymes optium tep it will not work as wella nad may deneture this also happens with ph
    • fitness & health
      • blood is under constant pressure due to contrations of the heart
        • ateirys carry blood away from the heart
          • two measurements systolic when the heart beats and distolic when the heart relaxes
            • blood pressure is messured in millimeters of mercuray
            • blood pressure is affected by stress age deit smoking achol intake
              • extre blood pressuers include kidny damge burst blood vessils brain damage and stroke
                • low blood pressure can cause fanting dissneyness and poor blood curculation
                  • it is possibel to be fit but unhalthy or healthy and unfit
    • human health and deit
      • carbohydrats are used for energy whithin the body
        • fats are used to insulate our body
        • protines are used for grouth and repair
          • fibers are used to help our digestion
            • a blance deit is needed to stay healthy
    • staying healty
      • your body is constaly fighting off infection
      • for exsampel viruses and bactira
        • bactira can mutiply rapidly and relaes toxins that make us ill
      • viruses take over cells and repproduce hundres of copys of themselfs and then blow the cell up
        • one major way to reduce the spred of bactirs is by staying clean and always washing you
      • cells that fight off infection are called white blood cells called fagosytes and lympsytes
        • fagosites eat the microorgnisum and lympsite
          • vacinations are whn you pu an un active or dead form of a miroorgnisum so the body recognises them and knows how to fight it off
      • no vacination for the common cold beacuse it keeps changeing
      • anti biotics can be used to kill bactira
        • bactira can devlope resitance
          • to ovid tis only use antibotica when nessary and always finsh the course
    • the nervouse sytem
      • alows body to react to canges in the envroment
      • usaly codanted by the brain
      • reflex actions bypass the brain
      • central nervose sytem consists of the brain and the spine
      • re cepchlised cells that react to changes in the envroment
        • the do this trough eletrical messages
        • when a receptor is stimulated it sends messages through the nurones to the brain
          • the brain then codnates the response
      • an efector is any part of the body that produces a repose to the stimli
      • 3 types of nurones sensory thatcarry singnals to the brain and relay that carrie messages from  the central nervose sytem to motro nurones and motor that carri singals from the brain to effectors
      • betwwen t]wo nurones their is a gapallesd asynapes this is where nero transmites are used to pass on the message
    • homiostasis
      • this means keeping in balance
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