In which animal is nerve cell present but brain absent?
Options
(a) Sponge (b) Earthworm (c) Cockroach (d) Hydra
Correct Answer:
Hydra
Explanation:
A primitive type of nervous system,without brain is found in […]
In vertebrates,simple reflex action is
Options
(a) polysynaptic (b) bisynaptic (c) trisynaptic (d) monosynaptic
Correct Answer:
monosynaptic
Explanation:
A reflex action is a nerve mediated spontaneous,automatic and involuntary response to a stimulus acting […]
In the myopia eye defect, the rays of light
Options
(a) Do not enter the eye at all (b) Come to a focus at back of retina (c) Come to a focus in […]
In saltatory conduction of impulse
Options
(a) time is conserved (b) energy is conserved (c) both time and energy are conserved (d) neither time nor energy is conserved
Correct Answer:
energy is conserved
In parasympathetic nervous system which of the following is released?
Options
(a) epinephrine (b) norepinephrine (c) serotonin (d) acetylcholine
Correct Answer:
acetylcholine
Explanation:
The parasympathetic nervous system acts by relesing a chemical substance,acetylcholine,at […]
In man which one of the following cranial nerve is associated with the sense of body balance?
Options
(a) VI (b) VII (c) VIII (d) XI
Correct Answer:
VIII
Explanation:
VIII,the auditory cranial […]
In mammalian ear, a membranous structure which separate the scala vestibuli and scala media is
Options
(a) Basilar membrane (b) Reissner’s membrane (c) Autolith membrane (d) Tectorial membrane
Correct Answer:
Reissner’s membrane
Explanation:
The […]
In humans, lipofucsin granules are found in
Options
(a) nerve cells (b) cardiac muscle (c) red muscle (d) cartilage
Correct Answer:
nerve cells
Explanation:
Lipofucsin granules are found in nerve cells.Their amount increases […]
In humans, aqueduct of sylvius is found in
Options
(a) heart (b) kidney (c) lung (d) brain
Correct Answer:
brain
Explanation:
Cavity of midbrain called iter or aqueduct of sylvius communicates with fourth […]
In a neuron the concentration of intracellular potassium and extracellular sodium is in a ratio of
Options
(a) 1:1 (b) 30:1 (c) 10:1 (d) 3:1
Correct Answer:
1:1
Explanation:
The amount of total […]
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