A diagram showing axon terminal and synapse is given. Identify correctly at least two of A - D.
C-Neurotransmitter
D-Ca+ +
A-Receptor
C - Synaptic vesicles
B - Synaptic connection
D-K+
A - Neurotransmitter
B - Synaptic cleft
The synaptic vesicles (represented by C) are present inside the axon terminals and they contain the neurotransmitters. They get attached to the pre-synaptic membrane and release the neurotransmitter in the synaptic cleft (represented by B) which gets attached to the receptor (represented by A) present on the post-synaptic membrane.
Hence, the correct answer is 'A-Receptor; C - Synaptic vesicles'