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Neural Control and Coordination Test - 66

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Neural Control and Coordination Test - 66
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  • Question 1
    1 / -0
    Parasympathetic system causes
    Solution
    • The pupillary light reflex is a reflex that controls the diameter of the pupil, in response to the intensity of light that falls on the retina of the pupil and the eye. 
    • Parasympathetic nerve fibres from the third (oculomotor) cranial nerve innervate the muscle that causes constriction of the pupil, whereas sympathetic nerve fibres control dilation. 
    • The increase in respiration rate and heartbeat is done by the stimulation from the Sympathetic nervous system. Also, the sympathetic nervous system inhibits sweat secretion.
    Thus, the correct answer is 'Constriction of pupil in bright light'.
  • Question 2
    1 / -0
    The portion of the eye which is differently coloured in different people and gives characteristically coloured eyes is the
    Solution
    Retina is the innermost layers of the eyeball. The cornea is the transparent anterior window of the outer layer of the eyeball located within otherwise opaque sclera. Iris is the colored part of the eye that imparts characteristic color of eyes to different people. 
    So, the correct answer is option D.
  • Question 3
    1 / -0
    More than one fovea centralis is found in the eyes of
    Solution
    In humans, the portion of the retina with the acutest vision is the fovea centralis, which has the highest concentration of cone cells. Predatory birds have two foveae, giving them an incredibly sharp sense of sight. Humans have only one fovea in each eye for binocular, or forward vision.The predatory birds contain a binocular fovea-like ours but also has a fovea for monocular vision, that allows each eye to look sideways and see a separate image. So, they can see both forward and to the side at the same time.
  • Question 4
    1 / -0
    The range of human vision is from few inches to
  • Question 5
    1 / -0
    Sequence of covering of eye, outer to inner is
    Solution
    Three different layers are the external layer, formed by the sclera and cornea the intermediate layer, divided into two parts, anterior (iris and ciliary body) and posterior (choroid), and the internal layer, or the sensory part of the eye, the retina. So, the correct answer is option A.
  • Question 6
    1 / -0
    Parts A, B, C and D of the human eye are shown in the diagram. Select the option which gives correct identification along with its functions/ characteristics.

    Solution
    • The space between the cornea and the lens is called the aqueous chamber and contains a thin watery fluid called aqueous humour.
    •  It Maintains the intraocular pressure and inflates the globe of the eye. It is this hydrostatic pressure which keeps the eyeball in a roughly spherical shape and keeps the walls of the eyeball stretched. 
    • Hence, the option which gives correct identification along with its functions/characteristics is C- Aqueous chamber - increase pressure inside the eye. 
    • So, the correct answer is 'C- Aqueous chamber - increase pressure inside the eye'.
  • Question 7
    1 / -0
    Consider the following statements and state true or false.
    1. Synaptic cleft of neurons secrete adrenaline.
    2. Myelinated nerve fibres and enveloped with Schwann cells, which form a myelin sheath around the axon.
    3. Non-myelinated nerve fibre is enclosed by a Schwann cell that does not form a myelin sheath.
    4. Spinal cord and cranial nerves are made up of non-myelinated nerve fibres.
    Solution
    Myelin sheath is the insulating envelope of myelin, that surrounds the core of a nerve fiber or axon and that facilitates the transmission of nerve impulses, formed from the cell membrane of the Schwann cell in the peripheral nervous system and from oligodendroglia cells. Nonmyelinated nerve fiber lacks the fatty myelin insulating sheath. Such fibers form the gray matter of the nervous system, as distinguished from the white matter of myelinated fibers. 
  • Question 8
    1 / -0
    Only organisms with two pupils in each eye
    Solution
    The four-eyed fishes are a genus, Anableps, of fishes in the family Anablepidae. They have eyes raised above the top of the head and consists two pupils in each eye so that they can see below and above the water surface at the same time. Due to the presence of two pupil in each eyes, they are called as four-eyed fish. 
    So, the correct answer is 'Anableps'
  • Question 9
    1 / -0
    Which of these is a somatic motor nerve controlling eye ball?
    Solution
    The trochlear nerve (the fourth cranial nerve) is a motor nerve, that innervates a single muscle: the superior oblique muscle of the eye which is the muscle of oculomotion (movement of the eyeball). The trochlear nerve is the smallest nerve in terms of the number of axons it contains. It has the greatest intracranial length. Finally, it is the only cranial nerve, that exits from the dorsal aspect of the brainstem. 
  • Question 10
    1 / -0
    The muscles responsible to move the eye ball are the
    Solution
    There are six muscles, which are responsible for controlling the movement of the eyeballs. They are - superior and inferior rectus muscles, lateral and medial rectus muscles, superior and inferior oblique muscle.
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