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How is heart rate controlled?

The heart muscle is myogenic , meaning that it is able to initiate its own contraction. The wall of the right atria has a region of specialised fibres known as the sinoatrial node (SAN). This node acts as th...
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Answered by Beth M. • Biology tutor
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What is a pathogen and what role do they have in causing disease?

A pathogen is a harmful organism that causes infectious diseases. There are many types of pathogens: bacteria, fungi, viruses, protoctists, worms and insects. They allow diseases to be transmitted from perso...
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Answered by Molly T. • Biology tutor
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Find the first derivative of 2x^3+5x^2+4x+1 (with respect to x)

In differentiation, your goal is to reduce the power of the terms that you're differentiating with respect to (in this case, x).The method for doing this is:Multiply the power of your x term by its coefficie...
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Answered by Abigail R. • Maths tutor
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Discuss one strength and one limitation of the biological approach (4 marks)

The biological approach takes a deterministic stance, explaining all human behaviour as controlled by some component of the person's physiology, such as genetics or neurotransmitters. It is therefore consist...
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Answered by Hannah G. • Psychology tutor
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Simplify the following algebraic fraction; (3x^2 - x - 2) / ((1/2)x + (1/3)).

First we need to factorise the numerator into two expressions. We can see one expression must start (3x + ?) and the other therefore must hold (x + ?), we know this because the two brackets must multiply tog...
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Answered by Bobbi L. • Maths tutor
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