OFFICIAL OCR A2 Biology - F214 Thread

Animal behaviour= massive win =D=D I do a lot of dog training.

Safe guys, just started revising today and am slightly confused on the nerves section...Can someone explain the difference in structure between motor and sensory neurones?

I'm using the 'Biology for OCR' textbook (by Mary Jones) and they go through motor neurones in a lot of depth but barely dedicate a few sentences to the sensory neurone structure.

Basically, this picture isn't amazing but it does what I need it to. Sensory Neurone B. The spiky things just before the axon starts is known as an axon terminal. The axon carries the action potential away from the cell body, the dendrite carries it away from the cell body. It has a cell body in the MIDDLE, whereas the Motor neurone has it at the start. The Motor neurone A has a cell body at the start, and its dendrites are the little spiky like tendrils you see, hence they carry the action potential towards the cell body from the CNS. The axon carries the action potential away from the cell body, towards the effector which is usually a muscle or gland. The sensory neurone receives the stimulus from the sensory receptor, and if the threshold is reached, an action potential is generated.

Is that better or?

Ah yeah, that has helped quite a bit. Thanks for the info...

(c) Explain how respiration in plants and animals depends upon the products of photosynthesis;
Photosynthesis is the main means by which plants, algae and many bacteria produce organic compounds and oxygen from carbon dioxide and water (green arrow). The organic compounds are used again in photosynthesis (red arrow). Whereas, the oxygen produced by photosynthesis is used for respiration. Oxygen was first released as a product of photosynthesis, once the atmosphere contained free oxygen organisms evolved that could use the oxygen for aerobic respiration and release CO2 back into the atmosphere.
http://upload.wikimedia.org/wikipedia/commons/thumb/2/2f/Auto-and_heterotrophs.svg/300px-Auto-and_heterotrophs.svg.png

Is that all we need to know for this part?

Right. How much has everyone else done? I've done all the chapters apart from Excretion. It's just so long...ill probably cram that in a few days before the exam. I've never started revising for an exam this early though...feels a bit wierd.

No problem. I like to help .

hehe I remember you from the AS bio threads :P
(those where a real help )
Ive only started revision today :O and im freaking out
when is the exam?

Bio F214: 25th Jan 2010.

I've got chem F234 On 27th Jan 2010

I also have a long morning on 12th Jan 2010 ~ F211, F212.

Wish me luck!

A2:Biology, Chemistry, Mathematics (All OCR new spec)