Destruction of the anterior horn cells of the spinal cord would result in loss of
sensory impulses
voluntary motor impulses
commissural impulses
integrating impulses
A diagram showing axon terminal and synapse is given. Identify correctly A-D.
B-Synaptic connection D-K+
A-Neurotransmitter B-Synaptic cleft
C-neurotransmitter D-Ca2+
Parts A, B, C and D of the human eyes are shown in the diagram. Select the option
which gives correct identification along with its functions/characteristics
A-retina-contains photoreceptors-rods and cones
B-blind spot-has only a few rods and cones
C-aqueous chamber-reflects the light which does not pass through the lens
D-choroidits anterior part forms ciliary body
Which part of the human ear plays no role in hearing as such but is otherwise very much
required?
Eustachian tube
Organ of Corti
Vestibular apparatus
Ear ossicles
The purplish red pigment rhodopsin contained in the rods type of photoreceptor cells of
the human eyes is a derivative of
vitamin-C
vitamin-D
vitamin-A
vitamin-B
When a neuron is an resting state, ie, not conducting any impulse, the axonal membrane
is
equally permeable to both Na+ and K+ ions
impermeable to both Na+ and K+ ions
comparatively more permeable to K+ ions and nearly impermeable to Na+ ions
comparatively more permeable to Na+ ions and nearly impermeable to K+ ions
The nerve centres which control the body temperature and the urge for eating are
contained in
hypothalamus
pons
cerebellum
thalamus
Alzheimer disease in humans is associated with the deficiency of
dopamine
glutamic acid
acetylcholine
Gamma Amino Butyric Acid (GABA)
The kind of tissue that forms the supportive structure in our pinna (external ears) is also
found in
vertebrae
nails
ear ossicles
tip of the nose
Given below is a diagrammatic cross section of a single loop of human cochlea.
Which one of the following options correctly. represents the names of three different
parts?
B : Tectorial membrane C: Perilymph
2. C: Endolymph nbsp; D : Sensory hair celis
3. D: Sensory hair cells A: Endolymph
4. A : Perilymph B: Tectorial membrane
Which one of the following is the correct difference between rod cells and cone cells of our retina?
Features
Rod Cells
Cone Cells
1.
Visual acuity
High
Low
2.
Visual pigment contained
Iodopsin
Rhodopsin
3.
Overall function
Vision in poor light
Colour vision and detailed vision in bright light
4.
Distribution
More concentrated in the centre of the retina
Evenly distributed all over the retina
During the propagation of a nerve impulse, the action potential results from the movement of
K+ ions from extracelular fluid to intracellular fluid
Na+ ions from intracellular fluid to extracellular fluid
K+ ions from intracellular fluid to extracellular fluid
Na+ ions from extracellular fluid to intracellular fluid
Cornea transplant in humans is almost never rejected. This is because
its cells are least penetrable by bacteria
it has no blood supply
it is composed of enucleated cells
it is a non-living layer
Which one of the following is an example of negative feedback loop in humans
cold
Constriction of skin blood vessels and contraction of skeletal muscles when it is too
Secretion of tears after falling of sand particles into the eye
Salivation of mouth at the sight of delicious food
Secretion of sweat glands and constriction of skin blood vessels when it is too hot
Bowman's glands are located in the:
proximal end of uriniferous tubules
anterior pitutary
female reproductive system of cockroach
olfactory epithelium of our nose
Which one of the following pairs of structures distinguishes a nerve cell from other types of cell ?
Perikaryon and dendrites
Vacuoles and fibres
Flagellum and medullary sheath
Nucleus and mitochondria
Which one of the following statements is correct?
Bowman's glands are found in :
olfactory epithelium
external auditory canal
cortical nephrons only
juxtamedullary nephrons
A person showing unpredictable moods, outbursts of emotion, quarrelsome behaviour and
conflicts with others is suffering from :
schizophrenia
borderline personality disorder (BPD)
mood disorders
addictive disorders
Which one of the following not act as a neurotransmitter?
Acetylcholine
Epinephrine
Nor epinephrine
Cortisone
In a neuron the concentration of intracellular potassium and extracellular sodium is in a
ratio of
1:1
30:1
10:1
3:1
Pick the odd-one out.
Nervous tissue : node of Ranvier
Ear: aqueduct of Sylvius
Bone : Volkman's canal
Eye: canal of Schlemm
Though sensitive to entire visible spectrum, the cones in the human eye show maximunm
sensitivity to
blue colour
green colour
red colour
all of these.
Unipolar neurons are found only in
early embryos
retina of the eye
spinal cord
Which of the following types of cells are found in retina ?
Neuroglial cell
Schwann cell
Amacrine cell
Purkinje cell
Which of the following minerals reduces the excitability of nerves and muscles ?
Potassium
Sodium
Magnesium
Manganese
Which of the following is a psychosomatic disorder?
Psychosis
Neurosis
Hypochondria
Schizophrenia
A frog has its brain crushed. But when pinched on the leg. The leg draws away. It is an
example of
neurotransmitter induced responsce
simple reflex
conditioned reflex
automated motor response.
Which of the following pesticides is an acetylcholinesterase inhibitor?
Aldrin
BHC
Endosulfan
Malathion
Identify the correct statement
In amniotes last nerve is spinal accessory.
In non-amniotes last nerve is vagus.
Optic is shortest nerve.
Olfactory nerves has mixed fibres.
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