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The heart functions as a pump, circulating blood around the body to the cells. This is the medium for oxygen being delivered to the cells. The heart has two sides, left and right. Each one contains a vent...

Normally, whenever we smell/touch/see/hear/taste anything, that information gets sent to our brain and is processed before the brain decides whether we need to respond to the information. However, in situ...

Geographic isolation occurs so the population is separated and the two groups cannot interbreed. Variation due to mutation arises in the separate populations leading to different alleles becoming dominant...

When an action potential occurs, the neuron reaches the maximum voltage of +40mV. It then begins to repolarise, with potassium ions diffusing back in to the neuron, down the concentration gradient. This m...

Haemoglobin is a protein consisting of four haem groups contained in four polypeptide chains. The loading of oxygen consists of oxygen binding to iron in the haem group at areas of higher oxygen concentra...