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An action potential depolarises the sarcoma and depolarisation travels down the T-tubules to the sarcoplasmic reticulum, which releases Ca 2+ (calcium ions) to the sarcoplasm. Ca 2+ cause tropomyosin to chan...

Ultrafiltration occurs in the nephron, the functional unit of the kidney. Blood enters a coiled network of vessels called the glomerulus from the afferent arteriole at a high hydrostatic pressure. The glomer...

There are 4 levels of structure associated with a globular protein; primary, secondary, tertiary and quarternary. The primary structure is the organisation of amino acids, bonded by peptide bonds. The second...

How I would explain to the student:pollution of streams and rivers because of fertiliser use, open sewers into water courseexcess nutrients get washed up in water courseplants flourish using these mineralsso...

After DNA has been transcribed into mRNA but before is it is translated into it's polypeptide amino acid chain, post-transcriptional changes take place.DNA, and therefore its corresponding mRNA are made up o...