Differentiate between: (Any four)
$(a)$ Myelinated and non-myelinated axons
$(b)$ Dendrites and axons
$(c)$ Rods and cones
$(d)$ Thalamus and Hypothalamus
$(e)$ Cerebrum and Cerebellum

Distinguish between (Any four):
$(a)$ Afferent neurons and Efferent neurons
$(b)$ Impulse conduction in a myelinated nerve fibre and an unmyelinated nerve fibre
$(c)$ Aqueous humour and vitreous humour
$(d)$ Blind spot and Yellow spot
$(e)$ Cranial nerves and Spinal nerves

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.

Read the following statements:
$(A)$ The neural system provides an organized network for point-to-point connections.
$(B)$ The endocrine system provides chemical integration through hormones.
$(C)$ The neural system is very simple in lower invertebrates.
$(D)$ Neurons can detect and receive stimuli but cannot conduct them.
How many of the above statements are incorrect?

If the $III^{rd}$ cranial nerve (oculomotor nerve) is damaged,it will lead to:

You are watching a horror movie and notice that your heart rate increases and your mouth becomes dry. What is the reason for this?