Edexcel BIOLOGY Doubts!!!!

[MKh]

anytime

[ayuwaza misaki]

can someone complete the remaining blanks for me please

Heart wall muscle is a special type of muscle called Cardiac muscle. This muscle can contract or relax without nervous stimulation and is thus described as _____________. To ensure that the cardiac cycle stays in sequence there is an in-built control mechanism. The wall of the right atrium contains a special region of muscle called the ______________ which sets up a wave of electrical activity causing the atrial walls to contract almost simultaneously. There is a band of fibres between the atria and ventricles which _______________ the wave of activity passing to the ventricle walls. The wave of activity is picked up by the ____________ situated in the septum at the junction of the atria and ventricles. The wave of activity then passes down the septum in the _________________ causing the ventricles to contract.


Thank you

the answers are in order:
myogenic
SAN (sinoatrial node)
Purkyne fibres
AVN (atrioventricular node)
heart (i'm not sure abt this one though)

[noor.h92]

Hello,

Im doing the January 2011 paper 3. can anyone help me with the first question, how do i draw the graph ?

[Amii]

How do we calculate the standard error and draw the error bar?

Could someone please help?

Thank you 

[Amelia]

How do we calculate the standard error and draw the error bar?

Could someone please help?

Thank you  

For standard error, read this link carefully. If you dont get it, I'll explain later.  
Error bar with example - http://www.ncsu.edu/labwrite/res/gt/gt-stat-home.html

[guMnam]

can some one tell me wats the diff between c & d .. i mean are they in the same stage of mitosis ??

[Amelia]

can some one tell me wats the diff between c & d .. i mean are they in the same stage of mitosis ??

Not a huge difference. The first picture is early Anaphase - chromosomes starting to pull apart & the the second one is just Anaphase (the stage which occurs before telophase).

[Amii]

For standard error, read this link carefully. If you dont get it, I'll explain later.  
Error bar with example - http://www.ncsu.edu/labwrite/res/gt/gt-stat-home.html

Thank you but I can google too 
Standard deviation = ? = sqrt [(?((X-?)^2))/(N-1)]. What??   

Anyway I will get it from my friend now - she finally woke up 

+rep for taking the pain .Thank you 

[guMnam]

Thank you but I can google too 
Standard deviation = ? = sqrt [(?((X-?)^2))/(N-1)]. What??   

Anyway I will get it from my friend now - she finally woke up 

+rep for taking the pain .Thank you 

By the way we dont need to noe all this stuff for unit 3 exam do we ?? :S i thought all tht part was in unit 6 =\

[guMnam]

Not a huge difference. The first picture is early Anaphase - chromosomes starting to pull apart & the the second one is just Anaphase (the stage which occurs before telophase).

and Thanks amelia.. so we say tht both of them are from anaphase yea ?? or one is early anaphase and 2nd is late anaphase?? (i guess both ans wud be correct )

any ways Thanks

[Amii]

By the way we dont need to noe all this stuff for unit 3 exam do we ?? :S i thought all tht part was in unit 6 =\

Did you check the sample paper for Unit 3?The graph has 1 mark for drawing the error bar. 

 

[guMnam]

no i didnt can u give me a link to it ??

[rameeziiii]

what do you guys recommend doing in prep for the exam? do all the practicals or do the past papers?

[Blizz_rb93]

what do you guys recommend doing in prep for the exam? do all the practicals or do the past papers?

id say revise the practicals then solve pastpapers and time yourself for good time management thats all thats left to do, exam is tomorrow

[Amii]

no i didnt can u give me a link to it ??

It's there in the edexcel site but something seems to be wrong with that site.Anyway -attached