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The funtion of the heart is to supply the body with oxygenated blood. In humans this is done by use of a double circulatory system. This means that the blood enters the heart twice before it is pumped to ...

Transcription occurs in the nucleus of the cell.The enzyme DNA helicase catalyses the 'unzipping' or splitting of the two DNA chains in the region of the gene by catalysing the breaking of the hydrogen bo...

Every organism has a tropic relationship in a food chain. Producers are at the bottom of the food chain and they are autotrophs, meaning they get their nutrition through sunlight via photosynthesis, for e...

• when the water potential of the blood is too low (1) * This is detected by receptors in the hypothalamus (2)* the pituitary gland in the brain then secretes more ADH (3) * ADH increases the permeabi...

yeast cells produce ethanol whereas muscle cells produce lactic acid as a by-product yeast cells produce CO2, muscle cells do not they both produce small amounts of energy