Which of the following is an example of the action of the autonomous nervous system?

Compare the following: (Any two)
$(a)$ Central neural system $(CNS)$ and Peripheral neural system $(PNS)$
$(b)$ Resting potential and action potential
$(c)$ Choroid and retina

Explain the following:
$(a)$ Role of $Na ^{+}$ in the generation of action potential
$(b)$ Mechanism of generation of light-induced impulse in the retina.
$(c)$ Mechanism through which a sound produces a nerve impulse in the inner ear.

$I.$ The endocrine system provides chemical integration through hormones.
$II.$ The neural system provides an organized network of point-to-point connections for quick coordination.
$III.$ The neural organization is very complex in lower invertebrates.
$IV.$ The human neural system includes $CNS$ and $PNS$.
Select the correct statements.

Draw labelled diagrams of the following:
$(a)$ Neuron
$(b)$ Brain
$(c)$ Eye
$(d)$ Ear

Read the following statements.
$I.$ Preganglionic nerve fibres of $III, VII, IX$ and $X$ cranial nerves are a part of the parasympathetic nervous system.
$II.$ $V, VII, IX$ and $X$ cranial nerves are mixed nerves.
$III.$ Trochlear nerves are the largest cranial nerves.
$IV.$ Abducens nerves are motor nerves and originate from the Gasserian ganglia.
Which of the above statements are correct?