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Context: We often think of a linear model of one pre-synaptic neurone linking up with one post-synaptic neurone. In reality, the nervous system is a large network, many pre-synaptic neuro...

Carbon dioxide, water and sunlight

At resting potential the voltage of the cell is ~ -65mV A neurone sends an impulse from sensory receptorsThis causes sodium ion channels to open on the dendritesThis allows the movement of Na+ ions into t...

A substitution mutation is when one base is swapped for another base.
There are several reasons why this might not change the functioning of an enzyme: DNA is a degenerative code. This means there is...