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How does blood circulate through the heart?

De-oxygenated blood in the body returns to the right atrium of the heart through the superior and inferior vena cava. This blood is pumped through to the right ventricle , the tricuspid valves prevent any ba...
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Answered by Clarisse B. • Science tutor
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How does anti-biotic resistance occur?

Anti-biotic resistance is a growing problem for humans now, exacerbated by the overuse and over reliance on anti-biotics. Bacteria colonies have genetic variation amongst the individuals which means they rea...
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Explain how a nervous impulse is transmitted across a synapse?

A synapse is the fluid filled gap between the presynaptic neuron and postsynaptic neuron. 1) An electrical impulse travels along an axon of the presynaptic neuron. 2) When the impulse reaches the nerve-endin...
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Answered by Alishba K. • Biology tutor
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Explain what is meant by the term osmosis?

Osmosis is the net movement of free water molecules from an area of high concentration to low concentration across a selectively permeable membrane.
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Answered by Oscar S. • Biology tutor
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i) Make y the subject of the expression x = ((a-y)/b))^1/2 ii) Simplify fully (2x^2 − 8)/(4x^2 − 8x)

i) Square both sides of the expression to make x^2=(a-y)/b Multiply by b to remove the fraction from the equation and then rearrange to make y the subject. bx^2=a-y --> y=a-bx^2 ii) First factor out 2 fro...
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Answered by Oscar S. • Maths tutor
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