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A stimulus causes a small influx of sodium ions into the cell, leading the cell to become more depolarised or more positive. If this reaches the threshold potential, of about -55 mV, then it will initiate...

Enzymes are biological catalysts, which means that they increase the rate of a specific reaction by lowing the required activation energy.
The lock and key hypothesis explains how the substrate (key)...

Okay, so let's get back to basics. What is an enzyme? An enzyme is a biological catalyst that speeds up chemical reactions. How does it do this? All enzymes have active sites, which is where certain molec...

The resting membrane potential inside the neurone (-70mV) is negative relative the outside! This means that even though there are both Na^{+ ...}