Top answers

Explain the process of synaptic transmission.

The arrival of an action potential at the presynaptic neurone causes voltage gated Ca2+ channels to open, allowing Ca2+ to diffuse into the synaptic knob. The increased intracellular Ca2+ concentration in th...
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Answered by Sophia M. • Biology tutor
3417 Views

What are the enzymes involved at each stage during DNA replication?

The initial ‘unzipping’ stage is carried out by DNA helicase , to create a fork of DNA with exposed base pairs. DNA helicase works by breaking the hydrogen bonds between base pairs. On the leading strand, a ...
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Answered by Alice G. • Biology tutor
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Explain how an action potential is transmitted from one neurone to another at a synapse.

A good answer would start with a definition of a synapse ('the junction between two neurones') and then be formatted as bullet points or numbers for clarity and backed up with a diagram. Action potentia l ar...
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Answered by Emily K. • Biology tutor
2939 Views

Explain the role of ADH in regulating the water potential of the blood.

Firstly, a description of water potential would be a good place to start. An example definition of this could be: the pressure created by water molecules. The greater the number of water molecules present, t...
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Answered by Ruby H. • Biology tutor
17726 Views

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 presynapti...
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Answered by Ishan J. • Biology tutor
2843 Views