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Biology
A Level

How are signals transmitted across a neuromuscular junction?

Calcium ions enter the presynaptic terminal via voltage gated calcium channels, once the presynaptic terminal is depolarised by an action potential.Calcium ions stimulate vesicles to fuse with the presyna...

Answered by Ishan J. • Biology tutor
2151 Views

Explain the process of synaptic transmission

An action potential reaches the presynaptic neurone. This causes calcium channels to open, leading to calcium ions entering the synaptic knob via facilitated diffusion. This causes synaptic vesicles conta...

Answered by Thomas K. • Biology tutor
2287 Views

What is the difference between transcription and translation?

(Insert diagram of the central dogma DNA -> RNA -> Protein)Transcription is the process of converting DNA to RNA. First, within the nucleus, DNA helicase

Answered by Sabahat S. • Biology tutor
2180 Views

What is mRNA splicing and why is it important?

mRNA splicing is a form of post-transcriptional modification of the mRNA transcript. DNA is made up of coding regions called Exons. These determine the amino acid sequence of a polypeptide chain during pr...

Answered by Katherine P. • Biology tutor
9131 Views

Some poisons work by interfering with synaptic transmission at a neuromuscular junction. Describe the events at a synapse which lead to an action potential.

Across a membrane, there is a voltage at rest and this is known as the resting potential. This is deermined by the membrane permeability to different ions ie which ion channels are open at rest, and also ...

Answered by Leena C. • Biology tutor
2031 Views

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