Retina is most sensitive at
optic disc
periphery
macula lutea
fovea centralis
CNS is mostly made of
motor neurons and sensory neurons
sensory neurons and association neurons
association neurons
motor neurons and association neurons
In the chemistry of vision in mammals, the photosensitive substance is called
sclerotin
retinal
rhodopsin
melanin
The sympathetic nerves, in mammals arise from
sacral nerves
cervical nerves
thoraco-lumbar nerves
III,VII,IX and X cranial nerves
Function of iris is to
move lens forward and backward
refract light rays
bring about movements of eye lids
alter the size of pupil
One function of parasympathetic nervous system is
contraction of hair muscles
stimulation of sweat glands
acceleration of heart beat
constriction of pupil
Acute vision is present in
vulture
shark
bat
frog
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
Vagus nerve is
X
IX
VII
V
