You are watching a horror movie and you notice that your heart is beating fast and mouth is dry. This is due to:

Which of the following statements are correct?
$(i)$ $Ramus$ $dorsalis$ branch of spinal nerve contains sensory as well as motor nerve fibres.
(ii) The preganglionic nerve fibres arise from the entire spinal cord.
(iii) There are $31$ pairs of spinal nerves.
(iv) The somatic nervous system transmits impulses from $CNS$ to visceral organs.
$(v)$ Reflex action is a sudden,thoughtful,and voluntary response to the applied stimulus.
Select the correct option.

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

Match the following:
$A.$ Reflex action $1.$ Involuntary action
$B.$ Multipolar $2.$ Neuron
$C.$ $Na^+$ and $K^+$ ions $3.$ Parasympathetic nervous system
$D.$ Increases secretion of saliva and digestive juices $4.$ Reflex action
$E.$ Knee jerk $5.$ Active transport
The correct sequence for $A, B, C, D, E$ is:

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

Given below is a table comparing the effects of sympathetic and parasympathetic nervous system for four features. Which one feature is correctly described?