White matter consists of
nerve fibres with myelinated sheath
nerve fibres without myelinated sheath
scattered areolar tissue
nerve fibres with blood vessels.
Correct Answer :
A. nerve fibres with myelinated sheath
Related Questions
Cranial and spinal nerves constitute
CNS
autonomic nervous system
peripheral nervous system
sympathetic nervous system
Which one of the following are purely motor nerves?
Olfactory, trochlear, abducens
Trigeminal, facial, auditory
Vagus, facial, abducens
Abducens, trochlear, oculomotor
The energy required for the transmission of impulse is obtained from
stimulating agent
brain
nerve fibre
synapses
The number of spinal nerves in man is
20 pairs
31 pairs
21 pairs
35 pairs
Foramen of Monro provides a passage connecting
brain and spinal cord
lateral ventricles with III ventride in brain
IV ventricle with optic ventride
middle ear with pharynx
Spinal cord is protected by
aorta
sternum
trachea
vertebral column
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
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 nodes of Ranvier are responsible for]
saltatory conduction
speed of conduction
reflex actions
direction of propagation of impulses
The second cranial nerve is
optic
trigeminal
olfactory
abducen
An afferent neuron is
motor
sensory
both (a) and (b)
none of these
Which of the cranial nerve is mixed :
Optic
Olfactory
Vagus
Trochlear
The synaptic knots are present at the terminal endings of
the neuron
the dendron
the axon
both (b) and (c)
The largest number of cell bodies of] neurons in our body is found in
white matter of spinal cord
white matter of brain
grey matter of brain
grey matter of spinal cord
Voluntary control over skeletal muscles originates in the
cerebellum
cerebrum
medulla oblongata
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
Body temperature, hunger and water balance is regulated by
hypothalamus
medulla oblongata
pons
cerebellum
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 autonomic nervous system controls
muscle contractions
reflex movement and equilibrium
activity of visceral organs
both (a) and (b)
Arborvitae includes
grey matter
white matter
both (a) and (b)
none of these
The brain is situated in a long case called the
cranium
atrium
sinus
both (a) and (b)
Spinal cord is a part of
CNS
SA node
AV node.
Parasympathetic nervous system
Purely motor nerve is
optic
abducens
ophthalmic
palatinus
The basic anatomic and physiologie unit of the nervous system is
nerves
neuron
nephron
brain
Which one of the animals has a nervous system but no brain?
Amoeba
Earthworm
Cockroach
Hydra
The smallest cranial nerve is
optic
olfactory
auditory
abducens
Corpus callosum of the brain connects
optic chiasma
two cerebral hemispheres
two olfactory lobes
two optic lobes
The SNS works through
acetylcholine
norepinephrine
noradrenaline
none of these
Sensory nerve fibres enter the spinal cord through
dorsal root
ventral root
cranial nerves
central canal
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