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The smooth muscle contracts, causing vasoconstriction. Vasoconstriction is the narrowing of the vessel lumen.

Oxygen is used in aerobic respiration. More energy is generated in aerobic respiration. Carbon dioxide and water are products of aerobic respiration, whereas lactic acid is the end product of anaerobic re...

Photosynthesis. This question may throw some students off because: 1: They may be used to the question phased as something like 'By what process do plants generate glucose' 2: They may not be aware that a...

• There is genetic variation within the population of bacteria
• The variation has occurred due to random genetic mutations
• This variation means that a bacterium may have a mutation th...

the connections within the retina explain this. there is a different density and distribution of different types of cells in the retina - the fovea, in the centre of the eye, has a high density of cone ce...