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Describe the structure of the heart and its function in the human circulatory system.

The heart is a muscular organ composed of 4 chambers ; the left atrium and right atrium (pl. atria ) and the left ventricle and right ventricle (pl. ventricles ). The left and right sides of the heart are se...
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Answered by Aine O. • Biology tutor
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Prove that cos(4x) = 8(cos^4(x))-8(cos^2(x)) + 1

cos(4x) = cos(2(2x)) = 2(cos^2(2x)) - 1 = 2 (cos^2(x) - 1)^2 - 1 = 8(cos^4(x)) - 8(cos^2(x)) + 1
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Answered by Harry T. • Maths tutor
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Explain the bonding and thus the properties of a carbon allotrope

Diamond- Each carbon atom is bonded to four other carbon atoms with strong covalent bonds in a tetrahedral structure (with bond angles of 104.9 degrees). As all four valence electrons are used for bonding, n...
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How are veins and arteries adapted to the transport of blood?

Artery walls are made up of smooth muscle tissue and a thick elastic layer which allows them to expand and contract easily, coping with the changes in blood volume that occur with each heartbeat. The muscle ...
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Answered by Amélie L. • Biology tutor
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Describe the process of DNA replication

In DNA replication, first the hydrogen bonds between the nitrogenous bases are broken catalysed by the enzyme helicase, causing the DNA double helix to unwind and unzip, leaving the nitrogenous bases exposed...
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Answered by Helena N. • Biology tutor
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