$I.$ 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.

$ECT$ is

Glucose and oxygen are required by the brain for a constant supply of energy to control the functions of our body organs. What will be the consequences if the brain is deprived of oxygen and glucose?
$I.$ Brain deprived of oxygen for just $5$ minutes will get permanently damaged.
$II.$ Glucose is important in the nerve impulse conduction.
$III.$ One side of the brain is unable to know what the other side is doing when it is deprived of oxygen.
$IV.$ Mental confusion will result if the brain is deprived of glucose.

Choose the correct option:
$(1)$ The saccule and utricle contain a projecting ridge called the $ \text{crista} / \text{macula} $.
$(2)$ The space between the cornea and the lens is called the $ \text{aqueous chamber} / \text{vitreous chamber} $.

$A$: Postganglionic nerve fibers of the parasympathetic nervous system have acetylcholine,while the sympathetic nervous system has adrenaline (epinephrine) as the neurotransmitter.
$R$: The sympathetic nervous system inhibits intestinal peristalsis,while the parasympathetic nervous system stimulates peristalsis.

The medulla contains centers which control