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Mitosis is the process by which cells divide and replicate themselves. It is how organisms (like humans) grow. During mitosis one cell (the parent cell ) splits into two daughter cells which are identical co...

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 respiring cells in the body. However, the pulmonary vein takes oxygenat...

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 process requires oxygen which we breath in....

'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. For exam...

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 hydrophobic part...