AQA GCSE - Unit 3 (P3,B3,C3) New specification papers.

anyone up for the revision game? :smile:

Reply 462

lolface32

Original post by Captain Anonymous

anyone up for the revision game? :smile:

Leggo brah!

What topic? :biggrin:

Reply 463

lolface32

Original post by Blake-inator

Why do we need ventricles though? why not just go from atrium to pulmonary artery or whatever?

Well look at the heart. If it did go from the Pulmonary artery blood would flow way to fast. Also, there would be a decrease in pressure, not a good thing :colondollar:

These are just my own personal theories, don't rely on it :smile:

Reply 464

B3/C3? choose ones? :colone:

Reply 465

B3. I will join aswell

Reply 466

Original post by Captain Anonymous

B3/C3? choose ones? :colone:

B3!!

Reply 467

what and how is dialysis carried out?

Reply 468

Original post by Captain Anonymous

what and how is dialysis carried out?

This is from the very top of my head as I have not revised this bit. Dialysis is the artificial removal of poisonous and excessive substances from the body, by the use of a dialysis machine.

A patient is attached to a dialysis machine, blood leaves there body and goes to the machine. In the machine it passes a membrane a, on the other side there is dialysis fluid. The dialysis fluid contains all the contents of substances such as mineral ions and water healthy blood should contain, as a result only the extra diffuses out of the blood across a concentration gradient. The filtered blood then passes back to the body.

Reply 469

Original post by Unknown505

This is from the very top of my head as I have not revised this bit. Dialysis is the artificial removal of poisonous and excessive substances from the body, by the use of a dialysis machine.

A patient is attached to a dialysis machine, blood leaves there body and goes to the machine. In the machine it passes a membrane a, on the other side there is dialysis fluid. The dialysis fluid contains all the contents of substances such as mineral ions and water healthy blood should contain, as a result only the extra diffuses out of the blood across a concentration gradient. The filtered blood then passes back to the body.

wow well done, wasn't expecting a detailed response like that! :eek:

, brilliant well done :tongue:

Reply 470

Oh thanks. I got one question for you.

Why do the cells on the lining of the small intestine have lots of mitochondria?

Reply 471

Minecraft27

Original post by Captain Anonymous

Physics unit 1 - 98 UMS (a*)
Physics unit 2 - 83 UMS (a)
Physics ISA - 100 UMS (a*)

Posted from TSR Mobile

P1 - 81 (A) <Terrible
P2 - 88 (A)
ISA - Probably 100 (My raw mark was 49/50)

Reply 472

Minecraft27

Original post by Unknown505

Oh thanks. I got one question for you.

Why do the cells on the lining of the small intestine have lots of mitochondria?

Because they need energy for active transport of food.

Reply 473

Next question please........

Reply 474

Original post by Unknown505

Oh thanks. I got one question for you.

Why do the cells on the lining of the small intestine have lots of mitochondria?

to carry out active transport which requires energy, as they cannot just depend on diffusion to absorb glucose due to the fact that the difference in concentration might not always be lower outside than inside.

Reply 475

Original post by Unknown505

Next question please........

What is the difference between: glucose,glycogen and glucagon?

Reply 476

Original post by Minecraft27

P1 - 81 (A) <Terrible
P2 - 88 (A)
ISA - Probably 100 (My raw mark was 49/50)

well done on unit 2 and ISA, your unit 1 is good as well :tongue:

.

I'm aiming for an A overall in physics so all is well :colondollar:

Reply 477

Ha Ha love this one. Glucose is the sugar found in your blood. Glycogen, is the insoluble glucose storage in the liver. And glucagon is the hormone secreted by the pancreas when there is a lack of glucose, to break down glycogen in to glucose.

Reply 478