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An action potential (electrical impulse) arrives at a synapse (a gap between two neurones) which causes calcium voltage-dependent gates to open in the presynaptic neurone. An influx of calcium ions trigge...
The reflex arc is designed for quick, reactive movements that are instinctive. E.g. when we touch a hot pan, we need to react quickly otherwise our hand will get really badly burned. If the signal went fr...
Remember that DNA replication involves many enzymes in its process- and that you need to know their names and what they do!it is also useful to remember the mechanisms behind DNA replication, and how DNA ...
Rough endoplasmic reticulum, Mitochondria, Golgi apparatus
CO2 from respiring tissues diffuses into erythrocytes (red blood cells) where it reacts with water to form carbonic acid (process catalysed by the enzyme carbonic anhydrase). The carbonic acid...
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