Name the cell type shown as cell A.
Name a cell type that makes a synapse with structure B.
Name the cells responsible for forming the myelin sheath.
State and explain the differences in impulse transmission between myelinated and unmyelinated neurones.
With reference to Fig. 8.2, describe how ion channel A differs from ion channel B.
Morphine binds to the opioid receptor in the presynaptic membrane, which prevents ion channel A from opening. Suggest and describe the effects of morphine binding to this opioid receptor on the functioning of the cholinergic synapse.
Morphine also binds to the opioid receptor in the postsynaptic membrane, causing ion channel C to open and allowing potassium ions to diffuse out of the cell. Suggest how this would affect the synapse.