iGCSE biology edexcel May 17th predictions

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I tried my best to explain it earlier in this thread, basically
In the kidneys - blood from the renal artery passes into the Glomerulus - a bundle of blood capillaries, and urea, water, glucose and salts are filtered out by high pressure (aka ultrafiltration), these pass into the Bowman's Capsule, protein isn't squeezed out because the molecules are too large. This mixture is known as the glomerular filtrate
The glomerular filtrate moves to the section of the nephron known as the proximal convoluted tubule, and all the glucose is reabsorbed by active transport because we need it for respiration. Then in the loop of Henle and the Distal Convoluted tubule useful salts are reabsorbed, and in the collecting duct some water is reabsorbed. If there's a low level of water in the blood the brain detects this and a hormone ADH (anti-diuretic hormone) is released by the pituitary gland, which travels to it in the blood, it acts on the wall making it more permeable to water. Left over is a solution of urine containing Urea, some salts, and some water. Which passes through the ureter to the bladder and is then released via the urethra

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oh !!! thanx :smile:

i dont understand one thing wher does the energy come from in active transport

Reply 43

themightysandu

Respiration - energy in the form of ATP is produced

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thanx

No problem, now anyone know any easy way of remembering stuff about fermenters and beer/yoghurt production?

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Reply 46

TheCe

Anyone did human biology? How was your exam?

Reply 47

TheCe

btw im also sittin igcse edexcel biology. Any general tips?

Reply 48

themightysandu

Original post by TheCe

btw im also sittin igcse edexcel biology. Any general tips?

Revise and plz don't brag about how easy it wasn't after Tuesday

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Reply 49

TheCe

Original post by themightysandu

Revise and plz don't brag about how easy it wasn't after Tuesday

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haha

i think i'm quite prepared just need to have a look at stuff here and there yano

how's your revision going?

Reply 50

themightysandu

Original post by TheCe

haha

i think i'm quite prepared just need to have a look at stuff here and there yano

how's your revision going?

Well, got 4 other exams to revise for next week so pretty depressing

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Reply 51

Pink_Sparkles

making yoghurt:
milk is pasteurized for 15_30 min on 85-95°c temp
homogenized to disperse the fat globules
then cooled to 40 to 45 and then lactic acid bacteria is mixed
mixture is incubated fr several hours so that bacteria digests the milk proteins and ferment lactose to lactic acid
yoghurt is stirred and cooled to 5°c
fruits flavourings and colorants may be added before packaging

Reply 52

TheCe

Original post by themightysandu

Well, got 4 other exams to revise for next week so pretty depressing

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oh
what grade are you predicting?

Reply 53

themightysandu

Original post by TheCe

oh
what grade are you predicting?

Straight A's and A*'s but the more I revise the more I realise I don't know,

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Reply 54

Pink_Sparkles

[QUOTE=themightysandu;64776403]Straight A's and A*'s but the more I revise the more I realise I don't know,

Posted from TSR Mobileyup happens to me too :frown: