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How does the kidney produce concentrated urine?

There are various mechanisms by which the kidney produces concentrated urine. The most important of these are the loop of Henle and the role of ADH, anti-diuretic hormone. Let's examine each of these in turn...
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Answered by Amy H. • Biology tutor
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A block of ice slides down the full height from one side of a 1m high bowl and up the other side. Assuming frictionless motion and taking g as 9.81ms-2, find the speed of the block at the bottom of the bowl and the height it reaches on the the other side.

Using the law of conservation of energy, the potential energy of the block is transferred to kinetic energy as it slides down. KE [0.5mv 2 ] = PE [mgh], v = √2gh v = √2 9.81 1 = 4.43 ms -1 The block's KE wil...
OS
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What is the factor theorem?

The factor theorem helps us to find factors of polynomial equations, by substituting in number values for x to see whether the equation equals zero. For any polynomial P(x), the factor theorem would state th...
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Answered by Alex T. • Maths tutor
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'All theodicies fail' discuss

The problem of evil states that an omniscient, omnipotent, benevolent God cannot exist due to the fact that there is evil in the world. If God exists in the way that we imagine, then he has the power and abi...
KD
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Critically assess the Teleological argument as proof for the existence of God

The Teleological argument states that the world was designed by a superior being (i.e God). There are various forms of the argument, one of which was created by St Thomas Aquinas in the 13th century. Aquinas...
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