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[A] : The synaptic knob contains mitocho...

[A] : The synaptic knob contains mitochondria and synaptic vesicles rich in chemical trans- mitters.
[R]: Chemical transmitters are neurohor- mones. Their release is related to `Ca^(++)` in- flux.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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The correct Answer is:
A
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[A] : In mammals, ends of presynaptic fibres are enlarged to form synaptic Knobs which are separated by a synaptic cleft from postsynaptic neurons. Each synaptic knob contains many mitochondria and small gran- ule-Iike synaptic vesicles filled with minute packets of the chemical that transmits impulses to postsynaptic neurons. [R]: The chemical transmitters are called neurohumors which proportionate to K^+ influx.

[A] : Synaptic vesicles fuse with membrane and release neurotransmitter molecules. [R]: Neurotransmitter attaches to receptor site and open sodium channels to allow sodium to flow into post synaptic cell causing depolarisation.

Chemicals which are released at the synaptic junction are called

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