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Two models have been proposed. The first being the 'Lock and Key Model' which simply describes the way in which the active site of an enzyme is complementary to the substrate shape, meaning that only the ...
Homeostasis
A nervous impulse travels to the neuromuscular junction and causes the release of acetylcholine into the synaptic cleft. Depolarisation of the motor end plate spreads through the muscle via transverse tub...
Red blood cells are shaped like a biconcave disc - increases SA:volume ration -> increase surface for oxygen to diffuse in and out of cell
Red blood cells are very small - 7...
Oxygen and carbon dioxide, dissolved in water, are exchanged by diffusion in the lungs. Blood travelling to the lungs is deoxygenated and instead of oxygen, carbon dioxide is bound to the red blood cells....
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