A2 Biology OCR June 2015 Revision Thread

Would you mind explaining osmoregulation to me? apart from that I think it's mainly the suggest questions that stump me

I personally suggest revising past papers from 2013 and 2012 because I highly doubt that they'd be repeating the same questions as last year's I did thatfor f212 and f211 exams and it was on point

what do we need to know about the divergence and convergence of the synapse(or neurone idk) could someone explain it please?

Convergence and Divergence is to do with synapses between axons and how many axons can be on one side

Convergence is when multiple axons meet together to trigger depolarisation in the post synaptic knob. This is good because multiple areas of the body can pick up on a stimulus and cause a response.

Divergence is when a single presynaptic knobs acetylcholine can reach multiple post synaptic knobs , this is good because whan a stimulus is picked up by the bosy the action potential can be sent to different parts of the body for a response.

This is my understanding if anyone thinks this isnt right just say

Convergence and Divergence is to do with synapses between axons and how many axons can be on one side

Convergence is when multiple axons meet together to trigger depolarisation in the post synaptic knob. This is good because multiple areas of the body can pick up on a stimulus and cause a response.

Divergence is when a single presynaptic knobs acetylcholine can reach multiple post synaptic knobs , this is good because whan a stimulus is picked up by the bosy the action potential can be sent to different parts of the body for a response.

This is my understanding if anyone thinks this isnt right just say

Convergence and Divergence is to do with synapses between axons and how many axons can be on one side

Convergence is when multiple axons meet together to trigger depolarisation in the post synaptic knob. This is good because multiple areas of the body can pick up on a stimulus and cause a response.

Divergence is when a single presynaptic knobs acetylcholine can reach multiple post synaptic knobs , this is good because whan a stimulus is picked up by the bosy the action potential can be sent to different parts of the body for a response.

This is my understanding if anyone thinks this isnt right just say

Convergence and divergence aren't in the f214 spec? Or have I missed something?

Hey, is this in the textbook by any chance? Never heard of it, so just wondering.
Thanks

My thoughts exactly

It's not in the spec but if you looks at the OCR Biology book page 20 under 'Role of synapses in the nervous system', you can see that the 1st and 2nd bullet points talks briefly about 'covergence' and 'divergence'.

I quote:
- 'Several presynaptic neurones might 'converge' to one post synpatic neurone. This would allow signals from different parts of the nervous system to create the same response. This could be useful where several different stimuli are warning us of danger'


- 'One presynaptic neurone might 'diverge' to several postsynaptic neurones. This would allow one signal to be transmitted to several parts of the nervous system. This is useful in the reflex arc. One postsynaptic neurone elicits the response while another informs the brain'.

It is mentioned but this is all it really mentions:
Several presynaptic neurones may converge together to allow signals from different parts of the nervous system to create the same response.
One presynaptic neurone may diverge to several post synaptic neurones to allow one signal to be transmitted to several parts of the nervous system- one may elicit a response, and one may inform the brain.

Hope that helps and it is F214, under the section of spec called..... hang on...
Outline the roles of synapses in the nervous system.

I dont suppose anybody has a link to the June 2014 F214 paper and mark scheme please?

Hello guys

How are your preparations for #f214
I am worried about it
Can someone explain what substrate level phosphorylation means ?

Thanks in advance .... cheeers !

Posted from TSR Mobile