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Questions involving processes in respiration and photosynthesis usually give high marks in the Biology A level AQA unit 4 papers. By understanding and learning key parts of the processes, you can ensure y...

Neurotransmission is a mechanism of propagating an electrical signal between neurons via the movement of charged particles. It is initiated when the arrival of an action potential at the axon terminal tri...

As an A* biology student, I believe I can help show others the best way to revise for biology and receive the grade they want. Firstly, acquire a text book that you know contains all the information from ...

As an action potential arrives at the presynaptic knob, the membrane is depolarised. This causes calcium channels in the membrane to open and calcium ions to flood in. This influx of calcium causes vesicl...

Many (Not all) neurons are myelinated by schwann cells. The myelination covers the neuron with a fatty layer with small gaps between each schwann cells. These small gaps are called nodes of ranvier. When ...