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The membrane of an axon consists of three main protein channels: the sodium/potassium pumps, voltage-gated sodium channels and voltage-gated potassium channels. These play a role in establishing the membr...
Depolarisation of plasma membrane opens voltage-gated calcium channels, allowing calcium ions to move into pre-synaptic bulb down the concentration gradientHigh intracellular calcium results in the mobili...
A good way to approach a source question (for AQA, for example) in order to achieve a high level answer is focusing on content and argument, tone and emphasis and provenance. In your essay you will have a...
Molecular shape depends on the number of electron pairs around the central atom. Electrons are negatively charged and so each of the electron pairs will repel each other. Lone pairs tend to repel more tha...
Deposition can occur firstly as a result of gravity settling. This happens when the energy required to transport sediment becomes too low. Large sediment is often deposition first. Deposition can also occ...
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