Which part of the human ear plays no role in hearing as such but is otherwise very much
required?
1. Eustachian tube
2. Organ of Corti
3. Vestibular apparatus
4. Ear ossicles
The purplish red pigment rhodopsin contained in the rods type of photoreceptor cells of
the human eyes is a derivative of
1. vitamin-C
2. vitamin-D
3. vitamin-A
4. vitamin-B
When a neuron is an resting state, ie, not conducting any impulse, the axonal membrane
is
1. equally permeable to both Na+ and K+ ions
2. impermeable to both Na+ and K+ ions
3. comparatively more permeable to K+ ions and nearly impermeable to Na+ ions
4. 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
1. hypothalamus
2. pons
3. cerebellum
4. thalamus
Alzheimer disease in humans is associated with the deficiency of
1. dopamine
2. glutamic acid
3. acetylcholine
4. Gamma Amino Butyric Acid (GABA)
The kind of tissue that forms the supportive structure in our pinna (external ears) is also
found in
1. vertebrae
2. nails
3. ear ossicles
4. 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?
1. B : Tectorial membrane
C: Perilymph
D : Secretory cells
2. C: Endolymph
D : Sensory hair celis
A: Serum
3. D: Sensory hair cells
A: Endolymph
B: Tectorial membrane
4. A : Perilymph
B: Tectorial membrane
C: Endolymph
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
1. K+ ions from extracelular fluid to intracellular fluid
2. Na+ ions from intracellular fluid to extracellular fluid
3. K+ ions from intracellular fluid to extracellular fluid
4. Na+ ions from extracellular fluid to intracellular fluid
Cornea transplant in humans is almost never rejected. This is because
1. its cells are least penetrable by bacteria
2. it has no blood supply
3. it is composed of enucleated cells
4. it is a non-living layer