OFFICIAL OCR A2 Biology - F214 Thread

Tinkerbelle &#9829

Is that in the OCR book with the brain on the front ?

In the CPG book it says adenylate cyclase :confused:

yep OCR by mary jones :p:

Reply 382

Tinkerbelle &#9829

Is that in the OCR book with the brain on the front ?

In the CPG book it says adenylate cyclase :confused:

ohh great three spellings lol???
someone clarify!!!!

three books have three different spellings
1)CGP
2)Biology 1
3)ocr biology

????????????? :confused:

Reply 383

CertifiedAngel

Thankies

, Oh i knew it had 3 phosphate groups but didnt know it was made rom ribose sugar and adenine base lol silly me x

Thanks :biggrin:

, im back! also picturing results day and uni - thats helping !

Ill just type out my notes.

I have notes on everything except control of heart rate and limiting factors on photosynthesis, so if anyone has those, would they type them out for me, that would be grand :smile:

ok i will post notes on these soon wait for me ok im gonna do physics revision first then I'll get back to you :smile:

in the meantine check my notes on photosynthesis and respiration if you haven't done that.
Then later on tonight around 22:00 I will post notes on photosynthometer finally lol

Reply 384

Remarqable M

ok i will post notes on these soon wait for me ok im gonna do physics revision first then I'll get back to you :smile:

LOL

same here wjec though -.-, wonder if you have the same board?:P

Reply 385

Tinkerbelle ♥

ibysaiyan

yep OCR by mary jones :p:

Mary Jones?

Just wondered if it was the same one I were using :smile:

Reply 386

InvoluntarySlacker

I'm dreading the June exam. Has anyone looked over it yet? Three times as hard as this one. :emo:

Reply 387

Exocrine glands ? These glands secrete substances into a duct.Pancrease in unique as it consists of 2 way secretion.
the exocrine juice consits of:
Amylase: catalyses hydrolysis of starch to glucose.
trypsin: catalyzes hydrolysis of polypeptides into amino acids.
Lipase: catalyzes hydrolysis of lipids into glycerol and fatty acids.

Reply 388

ibysaiyan

LOL

same here wjec though -.-, wonder if you have the same board?:P

The new OCR A2 physics :smile:

Reply 389

InvoluntarySlacker

I'm dreading the June exam. Has anyone looked over it yet? Three times as hard as this one. :emo:

yep especially stuff on Inheritance , alleles Grrrr

Reply 390

InvoluntarySlacker

I'm dreading the June exam. Has anyone looked over it yet? Three times as hard as this one. :emo:

please one test at a time..lol :smile:

Reply 391

ibysaiyan

yep especially stuff on Inheritance , alleles Grrrr

boringgggg...

Reply 392

Remarqable M

The new OCR A2 physics :smile:

i think u have the same exam boards as me for maths (edexcel), physics(ocr) and biology.

Reply 393

MadMaths

ohh great three spellings lol???
someone clarify!!!!

three books have three different spellings
1)CGP
2)Biology 1
3)ocr biology

????????????? :confused:

Just stick with adenyl cyclase why bother what these books are calling it and look what OCR has called it on their book. :smile:

Reply 394

MadMaths

boringgggg...

Reply 395

MadMaths

i think u have the same exam boards as me for maths (edexcel), physics(ocr) and biology.

Yep, Im dreadin physics because i've spent too much time revising biology initially i wasn't too scared about biology but once the class notes piled up I started my planning in mid october :biggrin:

Reply 396

MadMaths

i think u have the same exam boards as me for maths (edexcel), physics(ocr) and biology.

Maths AQA, Bio OCR, physics WJEC T.T
Unfortunately WJEC is the most hardest of all boards when it coms to PHYSICS GRRRRRRRRRRRRRR RAWR.

Reply 397

Remarqable M

Yep, Im dreadin physics because i've spent too much time revising biology initially i wasn't too scared about biology but once the class notes piled up I started my planning in mid october :biggrin:

basically our current module has:
4.1 SHM
4.2: 2 dimensional collisions.
4.3: Kinetic theory and 1st law of thermodynamics RAWR
4.4: Difference between electric and gravtational properties.
4.5: Circular orbits, Doppler shift, Black matter, Dark Energy, Keplers Law T.T
its on 28th .

Reply 398

Tinkerbelle ♥

Control of heart rate:
1) The sinoatrial node (SAN) generates electical impulses that cause the cardiac muscles to contract

2) The rate at which the SAN fires (heart rate) is unconsciously controlled by the medulla in the brain

3) Animals need to alter their heart rate to respond to internal stimuli, e.g. to prevent fainting due to low blood pressure or to make sure the heart rate is high enough to supply the body with enough oxygen.

4) Stimuli are detected by pressure receptors and chemical receptors:
i) There are pressure receptors called baroreceptors in the aorta and the vena cava. They're stimulated by high and low blood
pressure.
ii) There are chemical receptors called chemoreceptors in the aorta, the carotid artery and the medulla. They moniter oxygen
level in the blood (and CO2 and pH, which are also indicators of oxygen)

5)Electrical impulses from receptors are sent to the medulla along sensory neurones. The medulla processes the information and sends impulses to the SAN along motor neurones.

E.G:
High blood pressure -- Baroreceptors detect -- impulses sent to medulla, which send impulses to vagus nerve, secretes acetylcholine*, which binds to receptors on SAN -- cardiac muscles are the 'effectors' -- the response is that the heart rate slows down to reduce blood pressure back to normal.

*Acetylcholine is secreted when there's high blood pressure or high blood O2, low CO2 or high pH levels.
*When theres is low blood pressure it's noradrenaline that's secreted. Noradrenaline also secreted when low blood O2, high CO2 or low pH levels are detected.

Reply 399