A person is wearing spectacles with concave lenses for correcting vision. While not using
the glasses, the image of a distant object in his case will be formed.
on the blind spot
behind the retina
in front of the retina
on the yellow spot.
Unidirectional transmission of a nerve impulse through nerve fibre is due to the fact that
nerve fibre is insulated by a medullary sheath
sodium pump starts operating only at the cyton and then continues into the nerve fibre
neurotransmitters are relesed by dendrites and not by axon endings
neurotransmitters are released by the axon endings and not by dendrites.
Given below is a table comparing the effects of sympathetic and parasympathetic nervous system for four feature (a-d). Which one feature is correctly described?
The black pigment in the eye which reduces the internal reflection is located in
() retina
(c) cornea
(b) iris
() sclerotic.
Hearing impairment affects which part of brain?
Frontal lobe
Parietal lobe
Temporal lobe
Cerebellum
One common example of simplex reflex is
watering of mouth at the sight of a favourite food
climbing up a stairs in dark without stumbling
closing of eyes when strong light is flashed across them.
Injury to vagus nerve in humans is not likely to affect
gastrointestinal movements
pancreatic secretion
cardiac movements.
Which of the following nerves arises from organ of Corti?
Cochlear nerve
Abducens nerve
None of these
If medulla oblongata is destroyed then which of the following functions wil be effected ?
No vision
No memory
No response when pricked with needle
Which of the following is correctly labelled?
B:Scala vestibuli
C: Basilar membrane
D: Tectorial membrane
The release of chemical messenger from synaptic vesicles is under the influence of these ion(s)
Fe++ and S++
Ca++
Mg++ and Sr++
Which of the following is true for the function of labelled parts in the diagram below?
B - Fovea - No visual activity is present
C - Cornea - Helps to hold lens in place
D - Iris - Visible coloured portion of eye
Given is the diagrammatic representation of the sectional view of cochlea. Select the correct option regarding it.
() A - Organ of corti-responsible for maintenance of balance of the body and posture.
A small rise in the body temperature of humans is corrected by(i) sweating(ii) dilating the skin arteries(iii) constricting the skin arteries(iv) increased tension of muscles in the skin.
(ii) only
(i) and (ii)
(iii) and (iv)
Pacinian corpuscles occur in the skin of certain parts of body in mammals. These are
type of glands
pain receptors
naked tactile receptors
encapsulated pressure receptors.
The cavity of diencephalon is known as
second ventricle
third ventricle
fourth ventricle
Which one is an incorrect match?
Eustachian tube-Connects middle ear cavity with pharynx
Caloreceptor-Heat
Interoreceptor-Touch
The cranial nerves which originate from the medulla oblongata are
III, VIl and IX
VII, VII IX and X
VIlI, IX, X, XI and XII
Node of Ranvier occurs where
neurolemma is discontinuous
neurolemma and myelin sheath are discontinuous
myelin sheath is discontinuous
The brain disease caused due to accumulation of amyloid β-peptide is
Huntington's disease
Parkinson's disease
Alzheimer's disease
Which of the following part of human brain is also called emotional brain?
Limbic system
Epithalamus
Broca's area
Go through the following table comparing the effect of sympathetic and parasympathetic nervous system. Which one is matched correctly?
Features Sympathetic Parasympathetic Nervous System Nervous System
Pupil of eye Dilates Constricts
Heart rate Decreases Increases
Intestinal Stimulates Inhibits
Salivary Stimulates Inhibits secretion
How macula lutea and corpus luteum are related ?
Contribute in maintain pregnancy
Both are a source of hormones
Both are characterised by their yellow colour
Both are found in human ovaries
The cornea is a very important component of the human eye. The main function of the cornea is to
provide structural support to the eye
contain a concentrated amount of cone cells in the correct orientation
change the shape of the lens to enable the image to be focused on the retina
Animals possess nerve networks or nervous systems to respond to their environment. Butthe single celled Amoeba does not possesses any nerve cell, so, how it come to knowwhether a particle it encounters is a grain of sand and not its dinner?
By chemotaxis
By skin
By hormones
All of these
Assertion : Circular smooth muscles of iris contract when bright light falls on the eye.
Reason : Pupil gets constricted by the contraction of circular smooth muscles of iris.
Assertion : Tongue is a gustatoreceptor.
Reason : Receptors for gustatory sensations are located in the taste bund.
Assertion : All of the cranial nerves are said to be mixed nerves.
Reason : All cranial nerves carry both sensory and motor nerve fibres simultaneously.
Assertion : The chemical stored in the synaptic vesicles are termed as neurotransmitters.
Reason : Synaptic vesicles release these chemicals in the synaptic cleft.
Assertion : Nerve impulse can never be transmitted from dendrite or cell body of one neuron to the axon of the next neuron, across a synapse.
Reason : This happens because of the synaptic delay at each synapse.
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