Which of the following is/are controlled by the human brain?
$(a)$. Balance of the body
$(b)$. Circadian rhythm of the body
$(c)$. Human behaviour
$(d)$. Functioning of heart and kidneys

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

Where is postganglionic sympathetic cholinergic innervation found?

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.

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?

Give a brief account of
$(a)$ Mechanism of synaptic transmission
$(b)$ Mechanism of vision
$(c)$ Mechanism of hearing