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Author Topic: Biology help HERE ONLY!!  (Read 8438 times)

Offline lana

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Re: Biology help HERE ONLY!!
« Reply #60 on: May 27, 2009, 08:26:38 pm »
your welcome ...!!
thanks for the +rep  =]
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''To be yourself in a world that is constantly trying to make you something else is the greatest accomplishment.''

nid404

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Re: Biology help HERE ONLY!!
« Reply #61 on: May 28, 2009, 04:49:22 am »
im sorry to say that adrenaline does not target the epiglottis

Adrenaline- The hormone,adrenaline circulates round the body and affects great many organs, making them respond differently at different situations.

TARGET ORGAN                                            EFFECTS OF ADRENALINE                 BIOLOGICAL ADVANTAGE                            
 HEART                                                         Beats faster                             Sends more glucose and oxygen to the blood   
 BREATHING CENTRE IN THE BRAIN                     Faster and deeper breathing           Increased oxygenation                               
ARTERIOLES OF THE SKIN                              Constricts them                      Less blood to skin, more to the muscles   
ARTERIOLES OF THE DIGESTIVE SYSTEM              Constricts them                       Less blood for digestive system, more for muscles
MUSCLES OF ALIMENTARY CANAL                       Relax                                      more energy available for action                   
MUSCLES OF BODY                                       Tenses them                                 Ready for immediate action
LIVER                                                             Conversion of glycogen to glucose        higher energy production
FAT DEPOSITS                                                Conversion of fats to fatty acids           fatty acids available for muscle contraction


hope this helps and check the ppt
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nid404

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Re: Biology help HERE ONLY!!
« Reply #62 on: May 28, 2009, 11:52:43 am »
guys great site for ull            http://www.sep.alquds.edu/biology/?sf=edu3
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Offline acash09

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Re: Biology help HERE ONLY!!
« Reply #63 on: May 28, 2009, 12:06:52 pm »
hey anyone has full igcse biology notes in a doc or pdf format? ive tried many online revision notes but i need something that can be printed and revised from. any help appreciated. :)
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Offline SGVaibhav

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Re: Biology help HERE ONLY!!
« Reply #64 on: May 28, 2009, 12:10:53 pm »
hehe nid 333 posts  :D   xD
i will summarize the links in some time
im Zzz now | tired
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Offline Nera

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Re: Biology help HERE ONLY!!
« Reply #65 on: May 28, 2009, 04:31:57 pm »
can anyone explain 2 me phototropisms and specifically action of auxins
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Offline lana

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Re: Biology help HERE ONLY!!
« Reply #66 on: May 28, 2009, 04:47:07 pm »
phototropism is growth in response to the direction of light 
auxin is a hormone made in the tips of roots and shoots one effect of auxin is to inhibit growth of side shoots that's why a gardener who wants a  plant to stop growing taller and become more bushy will cut off the shoot tip so removing the source of auxin .

1-auxin effect in shoots : auxin in the shoots move away from the light to the darker side and encourages growth by increasing cell elongation so the darker side grows more than the lighter side and so the shoot bend towards light source
2-auxin effect in roots : gravity causes auxin to collect on the lower side ( towards the ground/soil) in this case it stops cells elongating(growth) which causes the root to bend downwards .

hope it helps  :)
« Last Edit: May 28, 2009, 04:55:25 pm by lana »
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Offline SGVaibhav

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Re: Biology help HERE ONLY!!
« Reply #67 on: May 28, 2009, 05:44:09 pm »
Auxins____


SWEETSH WHERE ARE YOU. SAIFALAN WHERE ARE YOU.
Do you all remember, the hair growing and ...
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Offline SGVaibhav

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Re: Biology help HERE ONLY!!
« Reply #68 on: May 28, 2009, 07:04:34 pm »
 ???  looks like sweetsh did not read this
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