Which part of the brain maintains posture and equilibrium of the body?

In a neuron,conversion of electrical signal to a chemical signal occurs at/in

How do we detect the smell of an agarbatti (incense stick)?

$(a)$ Name the part of the brain which controls:
$(i)$ voluntary actions,
$(ii)$ involuntary actions.
$(b)$ What is the significance of the peripheral nervous system? Name the components of this nervous system and distinguish between the origin of the two.

Explain the mechanism of reflex action.

$(a)$ Draw the structure of a neuron and label the following on it:
Nucleus,Dendrite,Cell body,and Axon.
$(b)$ Name the part of the neuron:
$(i)$ Where information is acquired.
$(ii)$ Through which information travels as an electrical impulse.