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Myelinated and non-myelinated neurones have different structures which is why the speed of action potentials differ. In a Myelinated neurone, a myelin sheath is wrapped around the axon. This myelin sheath...

Osmosis is the movement of water molecules from an area of high concentration to an area of low concentration through a selectively permeable membrane.

An enzyme is a type of protein, and proteins are made up of amino acids. The sequence of amino acids determines the shape of the enzyme, which in turns controls which substrates will or won't fit into the...

An autosomal linkage is when there are two gene loci found on the same autosomal chromosome, so they are quite likely to be inherited together.
Vocabulary:Gene loci: The position of a gene on a chro...

The pupil constricts (becomes smaller) to decrease the light entering the eye. This prevents damage to the eye.