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

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How do you test for sulfate ions?
Original post by Captain Anonymous
Describe the differences of arteries,veins and capillaies


Arteries - away form heart, thick walls, strong, elastic, high pressure
Veins- to heart, low pressure, thin walls, big lumen, valves
Capillaries - one cell thick (for diffusion), supply oxygen and food, remoe co2, really close to every cell, permeable walls
the closest word to it in mine is transpiration
The arteries carry oxygenated blood away from the heart to the body, this takes place at very high pressures therefore they have a very a small lumen but thick elastic fiber walls. The veins however don't travel at high pressure so they have a bigger lumen however they usually carry blood against the force of gravity so they have valves to prevent blood back flow. The capillaries have very thin walls enabling substances such as glucose to diffuse into desired cells efficiently.
Let me dig that word out
Original post by Blake-inator
How do you test for sulfate ions?


you add dilute hydrochloric acid to barium chloride solution and if a white precitate is formed, sulfate ions are present :biggrin:
Xenotransplantation: the production of genetically engineered pig organs that can be used on humans.
Explain how the periodic is displayed at present time
Original post by Captain Anonymous
Explain how the periodic is displayed at present time


Can we do Bio
What is meant by the term "sustainable food production"
Original post by Unknown505
What is meant by the term "sustainable food production"


Sustainable food production is producing food which is the most effeicent and least effective to the environment. It can be achieved by: eating food which has greater biomass by directly eating plants (shorten food chains), and farmers controlling the movement of animals so less energy is watsed so there is greater biomass availiable and lastly, contolling external conditions so the animals don't use energy from respiration to mantain body temperature ...

went on too much :cool:
Original post by Unknown505
Can we do Bio


sure, what is mycroprotein and why is it used :biggrin:
Original post by Captain Anonymous
Sustainable food production is producing food which is the most effeicent and least effective to the environment. It can be achieved by: eating food which has greater biomass by directly eating plants (shorten food chains), and farmers controlling the movement of animals so less energy is watsed so there is greater biomass availiable and lastly, contolling external conditions so the animals don't use energy from respiration to mantain body temperature ...

went on too much :cool:


No, arent you talking about effecient food production! :redface:
Original post by Unknown505
No, arent you talking about effecient food production! :redface:


yeah lol just realised :wink: - just read the first line then :colondollar:
Ive been taught that the definition is " the production of food in a manner which can continue for many years"
Original post by Unknown505
Ive been taught that the definition is " the production of food in a manner which can continue for many years"


yeah that's right, alongside my thing i would say is worthy of 2/2
Sustainable can mean the external environment/ future generation...
I be back in a bit.
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Avatar for Efemena15
Efemena15
OP
4
What is homeostasis and what needs to be controlled in the body?
Question: How does the heart effectively pump blood around the body? (6 marks)

Answer: The heart receives oxygenated blood from the lungs to the left atrium via the pulmonary vein. The atria will contract, moving the oxygenated blood to the left ventricle. When the left ventricle contracts, it forces the oxygenated blood up the aorta to the rest of the body. The body cells will use the oxygen and will send the deoxygenated blood back to the heart. The heart receives deoxygenated blood from the body to the right atrium via the vena cava. The atria will contract, moving the deoxygenated blood to the right ventricle. When the right ventricle contracts, it forces the deoxygenated blood up the pulmonary artery to the lungs again so that it can be re-oxygenated.

How many marks would you give that?
(edited 11 years ago)

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