The cause of death in a person bitten by a cobra is:

$A$ diagram showing an axon terminal and a synapse is given. Identify correctly at least two of $A - D$.

Nerve gas causes:

Arrange the following events in proper sequence during impulse transmission across a chemical synapse:
$(a)$ Fusion of synaptic vesicles with the cell membrane of the presynaptic neuron.
$(b)$ $Ca^{++}$ channels open and $Ca^{++}$ diffuses into the synaptic knob from the extracellular fluid.
$(c)$ Neurotransmitter binds with receptors of the postsynaptic cell.
$(d)$ Release of neurotransmitter by exocytosis.

New potential generated in the post-synaptic neuron during transmission of impulse is:

Identify the correct sequence of action potential transmission as it arrives at the axon terminal from the choices given below: