MEDIUM
AS and A Level
IMPORTANT
Earn 100
Distinguish between the input and the output in a homeostatic control mechanism.
Important Questions on Homeostasis
EASY
AS and A Level
IMPORTANT
Uric acid is a nitrogenous waste product, which is produced from the breakdown of purines. What are purines and what are they used for?
EASY
AS and A Level
IMPORTANT
Explain why it is important that carbon dioxide and nitrogenous wastes are excreted and not allowed to accumulate in the body.
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AS and A Level
IMPORTANT
Where has the blood in the capillaries surrounding the proximal convoluted tubule come from?
EASY
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IMPORTANT
What solutes blood contains that are not present in the glomerular filtrate?
EASY
AS and A Level
IMPORTANT
How reabsorption of water from the proximal convoluted tubule takes place?
MEDIUM
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IMPORTANT
State the name of the process by which water is reabsorbed.
EASY
AS and A Level
IMPORTANT
Calculate the volume of filtrate that enters the loops of Henle from the proximal convoluted tubules each minute.
MEDIUM
AS and A Level
IMPORTANT
Although almost half of the urea in the glomerular filtrate is reabsorbed from the proximal convoluted tubule, the concentration of urea in the fluid in the nephron actually increases as it passes along the proximal convoluted tubule. Explain why this is so.
