Question: 100% NCERT covered from Particular Keyword.Explanations are 100% from NCERT | [Difficult level: Easy] From NCERT NEET Derived Question.
Which of the following receptors are specifically responsible for maintenance of balance of body and posture ?
1. Basilar membrane and otoliths
2. Hair cells and organ of corti
3. Tectorial membrane and macula
4. Crista ampullaris and macula
Answer:4. Crista ampullaris and macula
👉The inner ear also contains a complex system called vestibular
apparatus, located above the cochlea. The vestibular apparatus is
composed of three semi-circular canals and the otolith (macula is the
sensory part of saccule and utricle). Each semi-circular canal lies in a
different plane at right angles to each other. The membranous canals are
suspended in the perilymph of the bony canals. The base of canals is
swollen and is called ampulla, which contains a projecting ridge called
crista ampullaris which has hair cells. The saccule and utricle contain a
projecting ridge called macula. The crista and macula are the specific
receptors of the vestibular apparatus responsible for maintenance of
balance of the body and posture.
👉The optic nerves leave the eye and the retinal blood vessels enter it at
a point medial to and slightly above the posterior pole of the eye ball.
Photoreceptor cells are not present in that region and hence it is called
the blind spot. At the posterior pole of the eye lateral to the blind spot,
there is a yellowish pigmented spot called macula lutea with a central pit
called the fovea. The fovea is a thinned-out portion of the retina where
only the cones are densely packed. It is the point where the visual acuity
(resolution) is the greatest.