The Nissl's granules of nerve cell are made on of
ribosomes
protein
DNA
RNA
The sympathetic nerves, in mammals arise from
sacral nerves
cervical nerves
thoraco-lumbar nerves
III,VII,IX and X cranial nerves
An action potential in the nerve fibre is produced when positive and negative charges on the outside and the inside of the axon membrane are reversed, because
more potassium ions enter the axon as compared to sodium ions leaving it
more sodium ions enter the axon as compared to potassium ions leaving it
all potassium ions leave the axon
all sodium ions enter the axon
Iris is part of
sclerotic
choroid/uvula
choroid and retina
sclerotic and choroid
During the propagation of a nerve impulse, the action potential results from the movement of
K+ ions from extracellular fluid to intracellular fluid
Na+ ions from intracellular fluid to extracellular fluid
K+ ions from intracellular fluid to extracellular fluid
Na+ ions from extracellular fluid to intracellular fluid
Which one of the following is the correct difference between rod cells and cone cells of our retina?
Function of iris is to
move lens forward and backward
refract light rays
bring about movements of eye lids
alter the size of pupil
In frog "fenestra ovalis" is
the opening in the auditory capsule which separates the middle ear from internal ear
the air-filled cavity of the middle ear
the communication between the pharynx and the tympanic cavity
the external opening of the tympanic cavity which is covered by the tympanic membrane
CNS is mostly made of
motor neurons and sensory neurons
sensory neurons and association neurons
association neurons
motor neurons and association neurons
One function of parasympathetic nervous system is
contraction of hair muscles
stimulation of sweat glands
acceleration of heart beat
constriction of pupil
