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Basically this means that if the threshold voltage of a neurone is reached -40mV, then a stimulus will be generated of always +40mV. If the threshold is not reached then there will be no signal.

Speciation is the EVOLUTION of a NEW SPECIES from an EXHISTING SPECIES. If two populations are seperated so the flow of alleles stops (e.g geographic isolation- a physical barrier that prevents the 2 from br...

Sex linkage is a type of genetic disease, where the gene with the faulty allele is carried on the X chromosome. Women have 2X chromosomes whilst men only have 1. Consequently if the diseased allele is recess...

Relative atomic mass is the average mass of an atom of an element, relative to 1/12 the mass of carbon-12.

Piaget believed that children are not able to undertake certain tasks until they are psychologically mature enough to do so. These developments don’t happen entirely smoothly and there are stages where child...