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Neural Control and Coordination Test - 18

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Neural Control and Coordination Test - 18
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  • Question 1
    1 / -0
    Who got the Nobel prize for describing in detail the visual
    cycle

    Solution
    George Wald got the Nobel prize for describing the visual cycle. He proposed that vitamin A is an important component in rhodopsin, a light-sensitive compound in the retina, and explained in a series of studies from the 1930s to the 1960s that how light causes rhodopsin to change form and be converted. This conversion gives rise to signals in a complicated network of nerve cells by which a number of reconnections and transformations occur before the signals eventually are transformed into visual impressions in the brain. 
    So, the correct option is A.
  • Question 2
    1 / -0
    The malleus, incus, and stapes are the modified bones of
    ...................respectively

    Solution
    C. Atricular, quadrate and hyomandibular
    Reason: There are three small bones present between the tympanic membrane and oval window that are collectively referred to as ossicles. These are malleus, incus and stapes. In mammals, ossicles are originated from earlier jawbones. Malleus is modified articular while incus is modified quadrate. Modified hyomandibular forms stapes.  
  • Question 3
    1 / -0
    In a mammal, the eyes are lubricated by the secretion of

    Solution
    Meibomian glands are tiny oil glands that are situated in the margin of the eyelids. These glands secrete oil that coats the surface of our eyes and keeps the water component of our tears from evaporating (drying out). Together, the water and the oil layer make up the tear film. This tear film lubricates and keeps the surface of our eyes healthy. It also affects how clearly we see.
    So the correct option is C.
  • Question 4
    1 / -0
    If the light source infront of an eye becomes bright suddenly

    Solution
    In response to sudden bright light, pupil constricts by the constriction of sphincter papillae muscles through parasympathetic nervous system, in order to protect retina from possible injury against bright light.
  • Question 5
    1 / -0
    In which direction cristae of rabbit ear helps in maintaining
    balance

    Solution
    The cristae of rabbit ear help sin maintaining balance in transverse position of longitudinal axis of semicircular canals.
  • Question 6
    1 / -0
    How many eye muscles are present which control all types
    of eye movement

    Solution
    Eye can be moved by 6 extrinsic ocular muscles attached to its posterior wall. Two are external and internal oblique muscle while the other four are rectus muscles.
  • Question 7
    1 / -0
    Ear drum is known as
    Solution
    The tympanic membrane also called the eardrum is a membrane in the human ear, that receives sound vibrations from the outer air and transmits them to the auditory ossicles in the tympanic (middle ear) cavity. 
  • Question 8
    1 / -0
    Nissl granules are absent in
    Solution
    Correct option: A

    Explanation:
    • Nissl granules are absent in Axon. The neuron is made up of a cell body (cyton), dendrites (dendron), axons and axon terminals. Nissl granules are discrete structures, which consist rough endoplasmic reticulum and free ribosomes. It is the main site for synthesize of proteins in neurons.
    • These are found in somata and dentrites region of the neuron, and not in the axon or axon hillock regions. 
    • Thus, Option A is correct.

  • Question 9
    1 / -0
    The human hindbrain comprises of three parts one of which is
    Solution
    • The hindbrain is the part of the brain which consists of three parts pons, the cerebellum and the medulla oblongata. 
    • They form the brainstem and medulla extends to the spinal cord. 
    • Cerebellum mainly maintains body balance and coordination.
    So, the correct answer is option C.
  • Question 10
    1 / -0
    The vibrations of the tympanic membrane are amplified approximately ............... times in the oval window.
    Solution
    The ear ossicles cause the oval window to vibrate; this is a small membrane-covered opening directly below the stapes. Since the ear ossicles amplify the vibrations of the tympanic membrane and since the oval window is much smaller than this membrane, the waves are amplified 15 to 20 times their original amount.
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