Multiple Choice QuestionsWhich of the following is the part of mid brain of rabbit?
Diencephalon
Cerebrum
Corpora quadrigemina
None of the above
Now-a-days cornea transplantation is very popular. The reason is that it
is easy to preserve
transplanted very easily
can be easily obtained
does not link with blood supply and immune system
Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that
nerve fibre is insulated by a medullary sheath
sodium pump starts operating only at the cyton and then continues into the nerve fibre
neurotransmitters are released by dendrites and not by axon endings
neurotransmitters are released by the axon endings and not by dendrites.
D.
neurotransmitters are released by the axon endings and not by dendrites.
A synapse occurs where the axon of one neuron (the pre-synaptic neuron) meets the dendrite of another (the post-synaptic neuron). At the tip of the pre-synaptic axon is a button shaped swelling called a synaptic knob, inside which are numerous mitochondria and vesicles packed with a substance called a neurotransmitter which at the time of nerve impulse conduction diffuse across the space and bind to receptors in the membrane of the post-synaptic cell. This opens ion channels in the post-synaptic membrane resulting in a change in its membrane potential and in the consequent generation of a nerve impulse.
Cornea transplant in humans is almost never rejected. This is because
it is composed of enucleated cells
it is a non-living layer
its cells are least penetrable by bacteria
it has no blood supply
Assertion : All motor neurons are efferent neurons.
Reason : Motor neurons conduct nerve impulses from the spinal cord to the brain.
If both assertion and reason are true and reason is the correct explanation of assertion
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false.
If both assertion and reason are false
Given is the diagrammatic representation of the sectional view of cochlea. Select the correct option regarding it.
A - Organ of corti-responsible for maintenance of balance of the body and posture.
B- Scala vestibuli-filled with perilymph that ends at the oval window.
C- Scala tympani-terminates at the round window which opens to the middle ear.
D- Basilar membrane - nerve impulses are generated against it.
Assertion: The optic nerves leave the eye at the point called blind spot.
Reason: Only cone are densely packed at the blind spot, hence is the name.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false.
Which of the following is correctly labelled
A: Reissner's membrane
B: Scala vestibuli
C : Basilar membrane
D: Tectorial membrane
The release of chemical messenger from synaptic vesicles is under the influence of these ion(s).
Cl-
Fe and S2+
Ca2+
Mg2+ and Sr2+
Assertion: Mylein sheath insulates the nerve fibre and prevents its depolarisation.
Reason: Nerve impulses are conducted more rapidly in non - myelinated nerve fibres than in myelinated ones.
If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion.
If assertion is true but reason is false.
If both assertion and reason are false
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