Which of the following statements is correct about node of Ranvier?
Axolemma is discontinuous
Myelin sheath is discontinuous
Both neurilemma and myelin sheath are discontinuous
Covered by myelin sheath
Retina is most sensitive at
optic disc
periphery
macula lutea
fovea centralis
What is the intensity of sound in normal conversation?
10-20 dB
35-60 dB
70-90 dB
120-150 dB
Third ventricle of brain is also known as
metacoel
rhinocoel
paracoel
diacoel
A person suffering from the deficiency of the visual pigment rhodopsin is advised to take more
radish and potato
apple and grapes
carrot and ripe papaya
guava and ripe banana
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
The junction between the axon of one neuron and the dendrite of the next is called
junction point
a synapse
a joint
constant bridge
One function of parasympathetic nervous system is
contraction of hair muscles
stimulation of sweat glands
acceleration of heart beat
constriction of pupil
Injury to vagus nerve in human is not likely to affect
tongue movements
gastrointestinal movements
pancreatic secretion
cardiac movements
Which of the following is regarded as a unit of nervous tissue?
Myelin sheath
Axons
Dendrites
Neurons
