b1 and b3 cont
- Created by: Andrei stephen
- Created on: 12-01-13 13:15
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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
- some plants and animals reproduce this way
- the cell seprates into to daghter cells
- the copys are split apart by spindels
- chromsones line up in the midel
- first the pearents cells chrosomes make identical copys of them selfs
- 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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- then some dna is swiched between simlar pairs
- first all the chromsomes copy themselfs
- sexual reprodution through meiosis whne the 23 indvual cells join intruducees veration this is how it works
- homeostatis
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