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Veins take blood towards the heart from the rest of the body. This is usualy deoxygenated blood because the oxygen has been taken up by respi...
Respiration is the process by which people (and other organisms) break down glucose (from sugars and charbohydrates in their food) in order to release energy. This pr...
'Division of labour' is a term that describes the specialised functions of cell organelles which come together to ensure the cell is capable of surviving as well as performing it's role in the body. F...
The cell membrane is a fluid matrix made of a phospholipid bilayer. Each lipid molecule has a hydrophilic, phosphorylated "head" and a hydrophobic, fatty acid "tail". The hydrophob...
The nucleus of a cell contains DNA molecules, which code for proteins. In humans, DNA is arranged into 46 linear, double-stranded molecules called chromosomes. Chromosomes of similar length are paired...
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