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
Sensitive pigmented layer of eye is
cornea
retina
sclerotic
iris
Respiratory centre is situated in
cerebellum
medulla oblongata
hypothalamus
cerebrum
Which of the following cranial nerves can regulate heart beat?
X
IX
VIII
VII
Vagus nerve is
V
Iris is part of
choroid/uvula
choroid and retina
sclerotic and choroid
In which animal nerve cell is present but brain is absent?
Sponge
Earthworm
Cockroach
Hydra
The sympathetic nerves, in mammals arise from
sacral nerves
cervical nerves
thoraco-lumbar nerves
III,VII,IX and X cranial nerves
In the chemistry of vision in mammals, the photosensitive substance is called
sclerotin
retinal
rhodopsin
melanin
Afferent nerve fibres carry impulses from
effector organs to CNS
receptors to CNS
CNS to receptors
CNS to muscles
