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Neural Control and Coordination Test - 9

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Neural Control and Coordination Test - 9
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  • Question 1
    1 / -0
    Which of the following defines the functions of autonomic nervous system?
    Solution
    • The autonomic nervous system consists of a somatic afferent pathway, a central nervous system integrating complex (brain and spinal cord), and two efferent limbs, the sympathetic and the parasympathetic nervous systems. Hence, Efferent and Afferent pathways are functions of the autonomic nervous system.
    So, the correct answer is 'Both (A) and (B)'.
  • Question 2
    1 / -0
    The sympathetic nervous system causes
    Solution
    • Whenever the sympathetic system is activated, the metabolism of our body increases.
    •  This increases CO2 levels and reduces the pH of the blood. This acts as a stimulus for the respiratory centre and the respiratory rate increases. The sympathetic system is usually activated at the time of exercise. Hence, The sympathetic nervous system causes Increased respiration.
      •  So, the correct answer is 'Increased respiration'.

  • Question 3
    1 / -0
    Cornea transplantation is successful as cornea is
    Solution
     Cornea is the anterior portion of eye which absorbs oxygen from the air. It is the only part of human body which is devoid of blood supply and absorbs oxygen directly from the air. Due to this reason, cornea can be successfully transplanted and this surgical procedure is known as keratoplasty. The damaged cornea is replaced by healthy or donated cornea and in this procedure there are very less chances of rejection by the immune system.
    So, the correct answer is 'Without blood supply'.
  • Question 4
    1 / -0
    Innermost layer of human eye is
    Solution
    A. Retina is the inner layer of eye. The image is perceived by brain and formed on the retina.
    B. Lens of eye is a crystalline structure in the eye ball which is held in place by ligaments that are attached to ciliary body. It is biconvex in nature and focus the light rays on the retina.
    C. Sclera is the external layer of eye that maintains the shape of eye and also protects it.
    D. Choroid is the middle layer of eye that contains many blood vessels.
    E. Cornea is the anterior portion of sclera which absorbs oxygen from the air. It is the only part of human body which is devoid of blood supply and absorbs oxygen directly from the air.
    So, the correct answer is 'Retina'.
  • Question 5
    1 / -0
    Myelin sheath is produced by ______________.
    Solution
    The correct option is C.
    Schwann cells makes myelin in the peripheral nervous system (PNS: nerves) and oligodendrocytes in the central nervous system (CNS: brain and spinal cord). In the PNS, one Schwann cell forms a single myelin sheath.
  • Question 6
    1 / -0
    In a similarity with photographic camera, retina acts as
    Solution
    In a photographic camera, image is formed on the film. Similarly, in eye, image is formed on the retina which is the light sensitive surface in the eye. The light rays enter the eye through an aperture called pupil. The eye lens which is biconvex, focus the light rays on the retina and an image is formed. Both the camera and eye have the ability to regulate the amount of light for image formation.
    So, the correct answer is 'Film'.
  • Question 7
    1 / -0
    Olfactory membrane is connected with __________.
    Solution
    A. Taste is perceived by taste buds present on tongue.
    B. Vision is perceived by photoreceptor cells present in retina and they may be cones (for daylight vison and coloured vision) or rods (for low light vision).
    C. Smell is perceived by olfactory membrane which is a structure present in upper part of nasal cavity.
    D. Hearing is perceived by organ of Corti in middle ear which contains many hair cells that are sensitive to sounds or vibrations.
    So, the correct answer is 'Smell'.
  • Question 8
    1 / -0
    Where is the $$3$$rd ventricle of the brain located?
    Solution
    Diencephalon is the part of the brain composed of the thalamus, subthalamus, hypothalamus, and epithalamus. The third ventricle of the brain is located in the diencephalon and is called its cavity. It is filled with cerebrospinal fluid. Thus, the correct answer is option D.

  • Question 9
    1 / -0
    Which nerve fibres supply the stomach and intestine?
  • Question 10
    1 / -0
    Maximum refraction of light occurs at ________.
    Solution
    A. Cornea is the anterior portion of eye which absorbs oxygen from the air and helps in focussing the light rays entering the eye. Maximum refraction (about 80%) of light occurs when it enters cornea.
    B. Lens is a transparent and crystalline structure present in eye which focusses the light rays to form an image on the retina.
    C. Iris surrounds the pupil and regulates the amount of light entering the eye by controlling the size of pupil
    D. Aqueous humour is a fluid present between cornea and lens.
    So, the correct answer is 'Cornea'.
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