QUESTIONS

(a) The diagram below shows the structure of a synapse

(i) Draw an arrow onto the diagram indicating the direction of information transmission.

(1)

 

(ii) Describe how transmission of information occurs across the synapse when an impulse arrives at the pre-synaptic vesicle.  

(4)

 

(iii) Suggest why synapses can be referred to as one way gates. 

(1)

 

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