Question

42) The precentral gyrus is involved activities. with A) sensory B) motor C) abstract mental D) visual perception 43) The receptors for hearing and equilibrium are the: A) ampullae B) hair cells C) saccules D) supporting cells. E) utricles. 44) The following is a list of the steps that occur in the production of an auditory sensation ) Pressure waves distort the basilar membrane on its way to the round window 2) Movement of the tympanic membrane causes displacement of the auditory ossicles 3) Infomation about the region and intensity of stimulation is relayed to the CNS over the cochlear branch of cranial nerve VIII 4) Sound waves arrive at the tympanic membrane 5) Vibration of the basilar membrane causes vibration of the hair cells against the tectorial membrane 6) Movement of the stapes at the oval window establishes pressure waves in the perilymph of the vestibular duct The proper sequence for these steps is: A) 2,4,1,6,5,3 B) 4,2,6,5,1,3 C) 4,2,6,1,5,3 D) 2,5,4,6,1,3 E) 2,4,6,3,5,1 45) Retinal, found in the visual purple in the rods of the retina, is synthesized from: A) vitamin B B) vitamin IE C) vitamin C D) vitamin D E) vitamin A 46) Which of the following descriptions applies/apply to the term myopia?: A ) image focused in front of retina B) corrected with a concave lens C) nearsightedness D) all of the above E) none of the above 47) The sensory neurons within the olfactory organ are stimulated by in the air: A) pollen B) chemicals C) water D) dust E) pressure

Answer 1

42) The Precentral Gyrus is responsible for the programming for MOTOR movements.It is also called as the primary motor area.

43) The receptor for hearing and euilibrium rely on a very specialised type of receptors called a HAIR CELL.There are six groups of hair cells in each inner ear : one in each of the three semicircular canals, one in the utricle, one in the saccule and one in the cochlea.

44) The proper steps in the production of an auditory sensation are :

4, Sound waves arrive at the tympanic membrane

2, Movement of tympanic membrane causes displacement of auditory ossicles

6,movement of stapes at oval window establishes pressure waves in perilymph of vestibular duct

1,pressure waves distort basilar membrane on their way to round window of tympanic duct

5,vibration of basilar membrane causes vibration of hair cells against the tectorial membrane , resulting in hair cell stimulation and neurotransmitter release

3,the intensity of stimulation is relayed to CNS over cochlear branch of CN VIII

Option C (4,2,6,1,5,3) is the right answer.

45) Retinal is a chromatophore ( pigment containing cell) , a substance formed by the oxidation of VITAMIN A   on prolonged exposure of the eye to light.

46) Myopia is a term named for nearsightedness that develops in eyes that focus images in front of retina instead of on the retina, which results in blurred vision.By suing concave lens , the refractive error of the eye can be corrected and the distant objects can be clearly seen who wears it.So the option D (ALL OF THE ABOVE) is the right answer.

47) the sensory neurons of olfactory nerves can detect smell or any odor giving substances present in the air.Hence the option B Chemicals is the right answer, as chemicals are used to produce fragrances.

The right options have been underlined for a clear understanding.

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