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Explain the importance of dialysis fluid containing no urea and normal plasma levels of salt, glucose and minerals. [4]

Dialysis is used to treat patients with kidney failure - it can also be referred to as renal replacement therapy (RRT). This means that the treatment acts to replace the function of normal kidneys - to filte...
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Answered by Khadija Y. • Biology tutor
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Can you outline the process of respiration in humans

Respiration is the process by which organisms make the energy they need to function. We will discuss respiration in humans. Both humans and some species of plant are known as facultative aerobes - meaning th...
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Answered by Oliver P. • Biology tutor
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can you explain the process of muscle contraction

Muscle contraction essentially depends on the interaction between actin light chains and myosin heavy chains in muscle fibres. We will first consider light chains; these are made up of actin filaments, aroun...
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Answered by Oliver P. • Biology tutor
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Rationalise the denominator of 2/(3-sqrt(2)).

First, rationalise the denominator by multiplying the top and bottom of the fraction by the conjugate of the denominator.(2/(3-sqrt(2))) ((3+sqrt(2))/(3+sqrt(2)))Next, expand the brackets - notice there will...
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Answered by Sophia A. • Maths tutor
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What is (x-5)^2

Separate the square: (x-5) 2 = (x-5)(x-5)multiply the variables: x 2 multiply the numbers: -5 x -5 = 25multiply a variable and a number: -5xtimes this value by two: -10xsum all answers: x 2 - 10x + 25
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Answered by Matthew B. • Maths tutor
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