The chemical transmitter of nerve impulses is
cholinesterase
acetyl CoA
acetylcholine
adrenaline
Correct Answer :
C. acetylcholine
Related Questions
The thermoregulatory centre of the body is
spinal cord
hypothalamus
cerebellum
pituitary gland
Mammalian heart is innervated by a branch of
trigeminal
facial
vagus
spinal accessory
Spinal cord is a part of
CNS
SA node
AV node.
Parasympathetic nervous system
All or none law of nerve impulse conduction states that
an impulse will continue to be conducted until the stimulus is removed
an impulse will be generated if the stimulus is of a particular strength, below which there won't be any response and increase above the minimal does not produce any enhanced effect
the brain receives the complete information or does not receive at all
none of these
In mammals the function of sympathetic nervous system is
contraction of hair muscles
contraction of pupil
stimulation of sweat glands
acceleration of heart beats
The synaptic knots are present at the terminal endings of
the neuron
the dendron
the axon
both (b) and (c)
Arborvitae includes
grey matter
white matter
both (a) and (b)
none of these
Voluntary control over skeletal muscles originates in the
cerebellum
cerebrum
medulla oblongata
none of these
Foramen of Monro is
gap in pelvic girdle of rabbit
foramen in the skull of frog
space in brain of frog and rabbit
pore in the interauricular septum in a mammalian heart
Functionally the parasympathetic system is
inhibitory
stimulatory
both (a) and (b)
at times inhibitory and at times stimulatory
Purely motor nerve is
optic
abducens
ophthalmic
palatinus
Stimulation of sympathetic nerve of heart accelerates the heart beats as a result of
release of acetylcholin
release of adrenalin
release of heparin
inhibition of cholinesterase
Birds can move swiftly and accurately in three dimensions of space due to well developed
cerebrum
cerebellum
pons varolii
medulla oblongata
The basic anatomic and physiologie unit of the nervous system is
nerves
neuron
nephron
brain
Which one is not at reflex action ?
Obeying an order
Release of saliva seeing sweets
Perspiration due to heat
Closing of eyelids against fricking
Nerve impulse is
carried by afferent and efferent branches
not carried by afferent and efferent branches
carried away and brought by efferent branches
brought by afferent and carried by efferent branches
The intensity of stimulus determines the
amplitude of action potentials in the neuron
amplitude and frequency of action potentials in a neuron
frequency of action potentials in a neuron
amplitude of resting and action potentials in a neuron
The outermost layer of brain is
pia mater
dura mater
arachnoid
none of these
Sensory nerve fibres enter the spinal cord through
dorsal root
ventral root
cranial nerves
central canal
The anterior choroid plexus is situated in the roof of
diocoel (III Ventride)
metacoel (IV Ventride)
olfactocoel
optocoel
An afferent neuron is
motor
sensory
both (a) and (b)
none of these
In mammals, the cerebral hemispheres are joined by
foramen magnum
corpus callosum
corpus spongiosum
corpora quadrigemina
Cranial and spinal nerves constitute
CNS
autonomic nervous system
peripheral nervous system
sympathetic nervous system
The number of spinal nerves in man is
20 pairs
31 pairs
21 pairs
35 pairs
The energy required for the transmission of impulse is obtained from
stimulating agent
brain
nerve fibre
synapses
The largest cranial nerve is
optic
facial
vagus
mandibular
The brain is situated in a long case called the
cranium
atrium
sinus
both (a) and (b)
The 8th cranial nerve of frog is
auditory
optic
olfactory
glossopharyngeal
The chemical transmitter of nerve impulses is
cholinesterase
acetyl CoA
acetylcholine
adrenaline
Cerebral cortex has centres of
thinking and intelligence
memory and learning
speech articulation
all of these