Figure 1. A dopaminergic synapse between two neurons A and B. 1. Explain how the different parts of the synapse shown in Figure 1
allow the transmission of an action potential between Neuron A and
Neuron B. [3 marks]
2. Cocaine is a drug that interferes with normal functioning of the
dopamine response
a. Explain why the presence of cocaine may increase feelings of
pleasure in the brain. [3 marks]
3. Figure 2 below is a graph showing the membrane potential in Neuron
B during and after the release of dopamine from Neuron A. The
graph shows changes in voltage in millivolts (mV) against time in
milliseconds (ms).