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How is a concentrated filtrate produced in the kidney to remove harmful toxins from the body?

To begin with, sodium ions are actively (using ATP) pumped out of the ascending limb of the loop of henle, however, as the ascending limb is impermeable, water remains . This creates a lower water potential ...
DW
Answered by Dan W. • Biology tutor
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I'm puzzled by some of the imagery in Frank O'Hara's poem 'Having a Coke With You'. Could you help?

Well, let's take perhaps the most obscure image in the poem, from the final lines of the first section: 'in the warm New York 4 o’clock light we are drifting back and forth / between each other like a tree b...
TB
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Differentiate y=(x^2 + 2x)cos(3x)

Here we need to use the product rule in order to differentiate as we have two functions involved that are being multiplied together. Therefore we use the formula:dy/dx = u dv/dx + v du/dxFirst let u=(x^2 + 2...
KB
Answered by Katie B. • Maths tutor
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Explain the teleological argument and Hume’s criticisms of it.

Essay Tips - Explain, evaluate, analyse- it is important to consider the wording of the question as it indicates how the essay should be structured and to what extent a critical response is required.- In exp...
TD
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Tom starts with 50 balls. Amy starts with 28 balls. If Tom gives 22 balls to Amy, what percentage of balls does Tom have compared with Amy?

This question requires 2 logical steps. The first is to calculate how many balls Tom and Amy have after the transaction. The second is to use a formula to calculate the percentage of balls left . Reading the...
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Answered by Dominic D. • Maths tutor
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