OCR Biology F211 resit - 16th May Watch

yamamotootsu
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#21
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#21
(Original post by rawr13)
same! was so pissed off that nothing came up on the heart.

you should try the june 2009 paper. it has a good mix of both but mainly heart/cells stuff
Thanks! will do


a) Describe the cardiac cycle, reference to the action of the valves in the heart.

b) Describe how heart action is coordinated with reference to the sinoatrial node, the atrioventricular node and the purkyne tissue.

anyone?
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aedai
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#22
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Someone please post about the diastole stage. I'm so confused about it.
When does it happen..
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abi.tanner
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#23
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diastole is when the muscles in the heart relax after having to withstand the high pressure in ventricular systole when the blood is pumped out of the heart to the whole body and the lungs, getting ready for the atrial systole.
when the cardiac muscles relax, the artria fill with blood increasing the pressure which leads to the atrial systole.
i'm pretty sure this is what happens. i did this without the text book infront of me so it's pretty much off the top of my head and very basic.
i hope it's actually right....
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si7hy
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just like to say that reading this has given me so much confidence in how im going to perform.

if some people cant get how to calculate magnification thennn... lawl
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aedai
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(Original post by abi.tanner)
diastole is when the muscles in the heart relax after having to withstand the high pressure in ventricular systole when the blood is pumped out of the heart to the whole body and the lungs, getting ready for the atrial systole.
when the cardiac muscles relax, the artria fill with blood increasing the pressure which leads to the atrial systole.
i'm pretty sure this is what happens. i did this without the text book infront of me so it's pretty much off the top of my head and very basic.
i hope it's actually right....
Does it go like this then. Atrial systole, atrial diastole, ventricular systole, ventricular diastole.

The atria's relax, which allows blood to flow in.. then the atrioventricular valves open due to pressure in the atrium and then the atriums contracts to allow blood to flow into the ventricles while they are relaxed. Ventricles contract and due to the pressure in the Ventricles, the semi lunar valves open and blood flows through the aorta/pulmonary arteries.

Have I even got that right? I'm seriously panicing as I did a whole poster on this before my first exam in Jan and I can't understand it when I read through and I used so many diagrams =/

Today I need to drill tissue fluid and lymph into my head somehow.. and go over bohr shift again and then recap over the notes I've done.
Beginning of this week I was really confident but now that I know heart is going to pop up..I don't think I'll do too well

anyway thanks for the post abi
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anonymous_angel_16
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(Original post by rawr13)
Hey, anyone got any specific predictions on what might be on the exam? since the jan one was mainly on plant stuff. ?
I think, based on January exam, spirometer is going to come up.
Heart (especially cardiac cycle since it has never came up), translocation, tissue fluid
these topics have a high chance of coming up but I obviously don't know for sure.
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yamamotootsu
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#27
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Revising for Biology in 1 day
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rawr13
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(Original post by yamamotootsu)
Thanks! will do


a) Describe the cardiac cycle, reference to the action of the valves in the heart.

b) Describe how heart action is coordinated with reference to the sinoatrial node, the atrioventricular node and the purkyne tissue.

anyone?


B) Basically the SAN initiates a wave of excitation which spreads across and down the atria. then it reaches the base of the atria where it meets a disc of tissue which cant conduct electricity. at the top of the inter-ventricular septum is the AVN node which is the only route through for the wave of excitation. <-- thats what basically causes the slight pause between the atria contracting and the ventricles contracting.

anyway the wave of excitation carries away from the AVN down the purkyne tissue to the base of the septum. wave of excitation spreads around walls of ventricles. The excitation spreads up from the apex (base) of the ventricles and therefore the muscles contract.


i think thats right anyway.
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yamamotootsu
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(Original post by anonymous_angel_16)
I think, based on January exam, spirometer is going to come up.
Heart (especially cardiac cycle since it has never came up), translocation, tissue fluid
these topics have a high chance of coming up but I obviously don't know for sure.

a spirometer consists of a chamber filled with oxygen floating on a tank of water. A person breaths from a mouthpiece attached to a tube connected to the oxygen tank. Breathing in takes oxygen from the chamber so it sinks down, and breathing out pushes air back into the chamber which floats up. The movements of the chamber is recorded using a datalogger.
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aedai
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(Original post by yamamotootsu)
a spirometer consists of a chamber filled with oxygen floating on a tank of water. A person breaths from a mouthpiece attached to a tube connected to the oxygen tank. Breathing in takes oxygen from the chamber so it sinks down, and breathing out pushes air back into the chamber which floats up. The movements of the chamber is recorded using a datalogger.
also remember the soda lime used which absorbs carbon dioxide.
Also a nose piece is used to prevent any air from escaping and keeping the results more valid.

Before using the spirometer you need to make sure the participant is healthy. You need to make sure that the mouth piece has been disinfected and ensure there are no leaks.

Theres lots of questions on the spirometer in the Jan 2010 exam
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rawr13
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past papers : http://pastpapers.org/as-papers/tran...biology-papers
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yamamotootsu
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#32
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Revising the cardiac cycle right now

Sequence of Contraction

1) Filling phase
2)Atrial Contraction
3) Ventricular Contraction

1) When both the atria and the ventricles are relaxed, blood flows into the heart from the major veins. The Blood flows into the atria, then through the open atrioventricular valves and into the ventricles. This phase is called Diastole

2) The atria contract simultaneously, pushing blood into the ventricles(atrial systole). Blood fills the atrioventricular valve, causing them to snap shut and preventing the blood from flowing back into the ventricles.

3) when the pressure in the ventricles is higher than the pressure in the arteries, the semilunar valves are pushed open and blood is pushed out of the heart. the ventricles relax. cycle repeats.
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bulletproof_love
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(Original post by yamamotootsu)
Revising the cardiac cycle right now

Sequence of Contraction

1) Filling phase
2)Atrial Contraction
3) Ventricular Contraction

1) When both the atria and the ventricles are relaxed, blood flows into the heart from the major veins. The Blood flows into the atria, then through the open atrioventricular valves and into the ventricles. This phase is called Diastole

2) The atria contract simultaneously, pushing blood into the ventricles(atrial systole). Blood fills the atrioventricular valve, causing them to snap shut and preventing the blood from flowing back into the ventricles.

3) when the pressure in the ventricles is higher than the pressure in the arteries, the semilunar valves are pushed open and blood is pushed out of the heart. the ventricles relax. cycle repeats.
Is this all we need to know about the cardiac cycle?
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Madmaz
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#34
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(Original post by rawr13)
use AIM to work out magnification.


Magnification = image size/actual size

be careful with converting your units. i.e into nanometres.
I always get my conversions wrong so I get the whole question wrong! How do you do yours??

Thank you!!!
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Madmaz
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(Original post by aedai)
also remember the soda lime used which absorbs carbon dioxide.
Also a nose piece is used to prevent any air from escaping and keeping the results more valid.

Before using the spirometer you need to make sure the participant is healthy. You need to make sure that the mouth piece has been disinfected and ensure there are no leaks.

Theres lots of questions on the spirometer in the Jan 2010 exam
In the mark scheme it said that you have to say the results were invalid to get the mark. I wrote more accurate and didn't get it just so everyone knows!
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yamamotootsu
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(Original post by bulletproof_love)
Is this all we need to know about the cardiac cycle?
pretty much it should at least get you a 5 mark question
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laureneb10
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Anyone know why the heart contracts from the base of the heart upwards?
Seriously screwed!
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bulletproof_love
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#38
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(Original post by yamamotootsu)
pretty much it should at least get you a 5 mark question
Oh okay thank you good luck for tomorrow btw
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bulletproof_love
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Does anyone know how to calculate the heart rate from an ECG? I can't find the info anywhere :/
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inspiration109
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(Original post by bulletproof_love)
Does anyone know how to calculate the heart rate from an ECG? I can't find the info anywhere :/
heart rate = beats per minute
so calculate how long it takes for 1 heart beat by looking at the graph
60/ time taken for one beat = heart rate
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