The sympathetic nerves, in mammals arise from
sacral nerves
cervical nerves
thoraco-lumbar nerves
III,VII,IX and X cranial nerves
In humans, visceral organs are innervated by
sympathetic nerves and are under conscious control
parasympathetic nerves and are under conscious control
Both (a) and (b)
both sympathetic and parasympathetic nerves but are not under conscious control
The Nissl's granules of nerve cell are made on of
ribosomes
protein
DNA
RNA
In which animal nerve cell is present but brain is absent?
Sponge
Earthworm
Cockroach
Hydra
Which of the following cranial nerves can regulate heart beat?
X
IX
VIII
VII
In the chemistry of vision in mammals, the photosensitive substance is called
sclerotin
retinal
rhodopsin
melanin
Retina is most sensitive at
optic disc
periphery
macula lutea
fovea centralis
Ivan Pavlov performed experiments on
simple reflexes
conditional reflexes
cardiac reflexes
origin of life
One function of parasympathetic nervous system is
contraction of hair muscles
stimulation of sweat glands
acceleration of heart beat
constriction of pupil
Afferent nerve fibres carry impulses from
effector organs to CNS
receptors to CNS
CNS to receptors
CNS to muscles
