IAL Biology unit 5

[eashaan]

http://www.edexcelbiosolutions.com/index.php/purchase-support
where can i get this for free its soo expensive these are bio unit 5 possible questions

 

[k.k.sibtain]

Yes! Even me!!

 

[noura mosharraf]

can any1 plzz explain the redistribution of blood during exercise?EMERGENCY!!

 

[saifulahmed49]

http://www.edexcelbiosolutions.com/index.php/purchase-support
where can i get this for free its soo expensive these are bio unit 5 possible questions

just read the article and find out the possible questions, like if you find a word that's in our specification, read everything about it!this book is so expensive, i don't think its worth it!i can sit for the exam at least five times instead of buying that book!

 

[noura mosharraf]

just read the article and find out the possible questions, like if you find a word that's in our specification, read everything about it!this book is so expensive, i don't think its worth it!i can sit for the exam at least five times instead of buying that book!

well the new EDEXCEL rule says that u can only repeat an exam only once.so i think the book might be a better bet

 

[noura mosharraf]

can sum1 give an answre for this question.why do we shiver when we have a fever?

 

[saifulahmed49]

can sum1 give an answre for this question.why do we shiver when we have a fever?

when we have fever we feel cold-
1. A part of your brain, called the hypothalamus, gets cold. It doesn't have to get very cold, just a little will be enough.
2. This part of your brain then makes your muscles shake. This way your muscles are moving, but you aren't running around. It works well.
3. This muscle shaking (shivering) makes a LOT of heat, can be as much as 3x as without shivering. If it is really cold, you won't be able to stop shivering until you go inside and get warm.
4. This will warm you up, and your hypothalamus. After a while you stop shivering.

 

[noura mosharraf]

what abt this question.my teacher asked me to do it.why isn't erythropoetin taken by sprint athletes?

 

[saifulahmed49]

what abt this question.my teacher asked me to do it.why isn't erythropoetin taken by sprint athletes?

i don't know if it's correct, it's just a guess.
sprint athletes have more fast twitch muscles, so more muscle cells respire aerobically. so i think a increase in red blood cells wouldn't cause any benefits.

 

[noura mosharraf]

guys i still don't get the difference between the roles of the sodium-potassium pump and sodium-potassium gated channels.can sum1 plzzz xplain?

 

[aniekan]

http://www.edexcelbiosolutions.com/index.php/purchase-support
where can i get this for free its soo expensive these are bio unit 5 possible questions

Don't bother buying it. The one for last year was pretty useless -_-

 

[Agent Z]

can sum1 give an answre for this question.why do we shiver when we have a fever?

There is a thermoreceptor in the hypothalamus which detect the change in temp of blood and hypothalumus sends impulses to muscles to shiver. Shivering is basically muscle contraction, and hence ATP is broken down, providing heat.

 

[Agent Z]

http://www.edexcelbiosolutions.com/index.php/purchase-support
where can i get this for free its soo expensive these are bio unit 5 possible questions

There are alot of good questions here for the article, no need to go buying around questions that you can logically make up. Read notes and do past papers! That should do it.

 

[aligatorviper]

guys i still don't get the difference between the roles of the sodium-potassium pump and sodium-potassium gated channels.can sum1 plzzz xplain?

the pumps uses energy to actively transport Na+ out of the axon and K+ into the axon. it works so long as atp is present i.e all the time.
the voltage gated channels help in facilitated diffusion of these ions. they depend on the voltage difference i.e the electrical gradient along the membrane.
correct me if im wrong
hope that helps.

 

[aligatorviper]

i don't know if it's correct, it's just a guess.
sprint athletes have more fast twitch muscles, so more muscle cells respire aerobically. so i think a increase in red blood cells wouldn't cause any benefits.

fast twitch muscles do not depend on aerobic respiration but on anearobic respiration. i guess epo increases O2 capacity. as fast twitch muslces dont need O2 they really dont require epo.

 

[aligatorviper]

when we have fever we feel cold-
1. A part of your brain, called the hypothalamus, gets cold. It doesn't have to get very cold, just a little will be enough.
2. This part of your brain then makes your muscles shake. This way your muscles are moving, but you aren't running around. It works well.
3. This muscle shaking (shivering) makes a LOT of heat, can be as much as 3x as without shivering. If it is really cold, you won't be able to stop shivering until you go inside and get warm.
4. This will warm you up, and your hypothalamus. After a while you stop shivering.

hypothalamus is the thermoregulatory centre. thermoreceptors sense drop in temperature and activate the heat gain centre in the hypothalamus. it sends impulses to the muscles to contract faster and more. so that heat is generated which will increase the temperature back to its normal value.
however it not only cause shivering but also activate other processes of the body to either produce heat or conserve it.

 

[aligatorviper]

can sum1 give an answre for this question.why do we shiver when we have a fever?

this fever is actually hypothermia i.e drop in body temperature.
thermoreceptors sense drop in temperature and activate the heat gain centre in the hypothalamus. it sends impulses to the muscles to contract faster and more. so that heat is generated which will increase the temperature back to its normal value.the contraction of muscles is shivering.
however it not only cause shivering but also activate other processes of the body to either produce heat or conserve it.