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OCR Gateway Biology B4B5B6 - 10/06/13

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Original post by L'Evil Fish
Thanks:smile:


Platelets form a clot?

What is hemophilia and what are the risks?


yeah and also platelets combine with fibrin and plasma to form the scab

And haemophilia is when the blood can't clot therefore can't form scabs, the risks are that if you are cut you will not be able to stop bleeding and it's easy to contaminate your blood so you are more susceptible to blood diseases...


Explain how the pacemaker cells work?
Original post by NatashaG
yeah and also platelets combine with fibrin and plasma to form the scab

And haemophilia is when the blood can't clot therefore can't form scabs, the risks are that if you are cut you will not be able to stop bleeding and it's easy to contaminate your blood so you are more susceptible to blood diseases...


Explain how the pacemaker cells work?


Sino-Atrial... Something?;( create electrical impulses that cause the atrium and (the other ones causes ventricles) to contract... Triggered by one another

What happens if valves are damaged, how can it be fixed?
Sino-atrial node and the other one is the AVN

if valves are damaged blood can flow backwards this decreases blood pressure, you can fix this with artificial valves

Umm

advantages and disadvantages of using a biological control as a method of controlling pests?
Original post by NatashaG
Sino-atrial node and the other one is the AVN

if valves are damaged blood can flow backwards this decreases blood pressure, you can fix this with artificial valves

Umm

advantages and disadvantages of using a biological control as a method of controlling pests?


+
No pesticides
Won't harm eco system badly

-
Might not kill pests
Might reproduce and become a pest
Might run away
Sorry this is a tad off topic, but does anyone have the Jan 2013 physics paper (1,2&3 ) ????
Original post by sarahiscool
Sorry this is a tad off topic, but does anyone have the Jan 2013 physics paper (1,2&3 ) ????


No sorry:frown:
Reply 306
Avatar for xKatex16
xKatex16
How did everyone find it?


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Original post by L'Evil Fish
+
No pesticides
Won't harm eco system badly

-
Might not kill pests
Might reproduce and become a pest
Might run away


Shall I ask yu the next question?
How does gas exchange happen in the lungs?
Original post by 123..help me
Shall I ask yu the next question?
How does gas exchange happen in the lungs?


:zomg: :lol:

It diffuses ?:wink:
Original post by L'Evil Fish
:zomg: :lol:

It diffuses ?:wink:


Yes that's right :h:
Another question? Describe zonation of species across a habitat??(part of book checklist...sounds posh ahah:smile: )
Original post by 123..help me
Yes that's right :h:
Another question? Describe zonation of species across a habitat??(part of book checklist...sounds posh ahah:smile: )


As we go along a habitat, the abundance of different species varies. This is because different specifies out compete each other in different conditions. Eg soil depth and salinity

How do detrititivores help plants make new cells?
Reply 311
Avatar for Elcor
Elcor
14
Hey guys, is there a thread for the Chemistry and Physics Unit 2 exams too?
Original post by andersson
Hey guys, is there a thread for the Chemistry and Physics Unit 2 exams too?


Yep!

Chem: http://www.thestudentroom.co.uk/showthread.php?t=2311641

I'll find physics now
(edited 10 years ago)
Reply 313
Avatar for Elcor
Elcor
14
I may as well become part of this question and answer thing. :laugh:

Q) In the whole of B4, 5 and 6, when does active transport occur (i.e. all cases of it you need to know)?
Reply 314
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Elcor
14
Original post by L'Evil Fish


Great - thank you. :smile: I need the constant reminder that I need to revise.
Original post by andersson
I may as well become part of this question and answer thing. :laugh:

Q) In the whole of B4, 5 and 6, when does active transport occur (i.e. all cases of it you need to know)?


B4 plants pulling it in, isn't that it? Or is it B5 too
Original post by andersson
Great - thank you. :smile: I need the constant reminder that I need to revise.


Physics http://www.thestudentroom.co.uk/showthread.php?t=2311644
Reply 317
Avatar for Elcor
Elcor
14
Original post by L'Evil Fish
B4 plants pulling it in, isn't that it? Or is it B5 too


Yeah, plants need to use active transport to get nutrients from the soil, since it's against the concentration gradient. You also need to know about it in B5; the nephron in the kidney has to use active transport to get sufficient water back (according to levels of ADH), sufficient salt back and all the sugars back into your blood from your urine-y liquid stuff.

It might be in B6, but I haven't started properly revising that yet.
Original post by andersson
Yeah, plants need to use active transport to get nutrients from the soil, since it's against the concentration gradient. You also need to know about it in B5; the nephron in the kidney has to use active transport to get sufficient water back (according to levels of ADH), sufficient salt back and all the sugars back into your blood from your urine-y liquid stuff.

It might be in B6, but I haven't started properly revising that yet.


Aaah, can't remember it in B6 :lol:
Reply 319
Avatar for Elcor
Elcor
14
Original post by L'Evil Fish
Aaah, can't remember it in B6 :lol:


I just skimmed my revision guide, it isn't in B6.

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