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Neural Control and Coordination Test - 37

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Neural Control and Coordination Test - 37
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  • Question 1
    1 / -0
    Which one of the following statement is correct regarding spinal cord?
    Solution
    • The brain and spinal cord together make up the central nervous system (CNS). 
    • The spinal cord extends from the medulla oblongata.
    • In the spinal cord, the grey matter extends from the brain into the spinal cord. The grey matter creates a hornlike structure throughout the inside of the spinal cord while the white matter makes up the surrounding sections of the spinal cord.
      So, the correct answer is option B.
  • Question 2
    1 / -0
    The muscles of the eyeball of a person becomes non-functional, the invariable effect would be _________.
  • Question 3
    1 / -0
    Which of the following statements about rods and cones is true?
    Solution

    Rods and cones are photoreceptors in the human retina. Rods are responsible for vision at low light levels (scotopic vision). They do not mediate colour vision and have a low spatial acuity. Cones are active at higher light levels (photopic vision), are capable of colour vision and are responsible for high spatial acuity. So, the correct answer is 'Rods are responsible for scotopic vision and Cones are responsible for photopic vision'.

  • Question 4
    1 / -0
    The sound waves if not focused by external pinna and ear cannal will result in ____________.
  • Question 5
    1 / -0
    The bundle of axons in the central nervous system is known as
    Solution
    In the central nervous system, a bundle of axons is called a tract. Ascending tracts carry impulses along the spinal cord toward the brain, and descending tracts carry them from the brain or higher regions in the spinal cord to lower regions. The main nerve tracts in the central nervous system are of three types – association fibers, commissural fibers, and projection fibers. So, the correct answer is option C.
  • Question 6
    1 / -0
    Cerebrum is part of
    Solution
    The brain is divided into 3 main parts, Hindbrain (rhombencephalon), Midbrain (mesencephalon) and  Forebrain (prosencephalon). Derivatives of prosencephalon are diencephalon and telencephalon (cerebrum). The cerebrum is the largest part of human brain. It consists of two cerebral hemispheres. It controls all involuntary movements. 
    Thus, the correct answer is option C. 
  • Question 7
    1 / -0
    A person has loss of control on emotions, which part of brain stops its function.
    Solution
    Memory, intelligence, logical thinking and reasoning are controlled by the cerebrum. For the cerebrum to function efficiently adequate amount of serotonin and dopamine has to be released, which does not occur or is hindered when a person loses control over his/her emotions or vice versa. 
    Therefore, when person loses control on emotions, the cerebrum is most likely to be affected.
    So, the correct answer is 'cerebrum'
  • Question 8
    1 / -0
    The fovea of eye
    Solution
    The macula is an oval shaped pigmented area near the centre of the retina of the human eye. Near its centre is the fovea, a small pit that contains the largest amount of cone cells in the eye and is responsible for central, high resolution vision. 
    Thus, the correct answer is option B.
  • Question 9
    1 / -0
    The function of our visceral organs are controlled by
    Solution
    Correct option: B
    Explanation:

    • The sympathetic nervous system and parasympathetic nervous system are subdivisions of the autonomic nervous system. 
    • The autonomic nervous system controls the involuntary functions of internal organs such as heart rate, digestion, breathing, urination, etc. They affect the visceral organs in different ways. 
    • Activation of the sympathetic system prepares the body for intense physical activity in emergencies and stress. 
    • In this case, the heart rate increases, blood glucose level rises and blood is diverted to the skeletal muscles (away from the visceral organs and skin). The effects of parasympathetic nerve stimulation are opposite to the effects of sympathetic stimulation. 
    • Stimulation of parasympathetic nerves can result in a slowing of the heart, dilation of visceral blood vessels and an increased activity of the digestive tract. 
  • Question 10
    1 / -0
    Which one of the followings is not a refractive medium of the eye ?
    Solution
    When light rays pass from a medium of one density to a medium of a different density, they are bent. This principle is called refraction and is used to focus light on the retina in the eye. Before reaching the retina, light rays pass successively through the conjunctiva, cornea, aqueous fluid, lens and vitreous body. They are all refractive mediums present in the eye except the pupil, which does not refract the light rays.
    So, the answer is D.

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