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Neural Control and Coordination Test - 46

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Neural Control and Coordination Test - 46
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  • Question 1
    1 / -0
    The exposed transparent region of eye ball represents
    Solution
    • Uvea is a pigmented layer of eye which is present beneath sclera and cornea. It comprises iris, choroid and ciliary body.
    • 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.
    • Conjunctiva is a thin transparent membrane lining the eyelids and protects the delicate cornea and front portion of the eye.
    • Sclera (the external layer of eye) and cornea together constitute the fibrous layer or fibrous coat of eye.
    The exposed transparent region of eye ball represents cornea and conjunctiva.
    So, the correct answer is 'Cornea and conjunctiva'.
  • Question 2
    1 / -0
    Intercellular communication in multicellular organisms occur through
    Solution
    In most higher animals there are two major pathways, or systems, of intercellular communication, the endocrine system and the nervous system. In the endocrine system, specialized glandular cells secrete hormones, which are carried in the bloodstream to target cells. In the nervous system, sensory receptor cells and a network of nerve cells with elongated processes communicate with one another and with muscles and glands by secreting neurotransmitters directly onto specific receiving cell.
    So, option C is the correct option.
  • Question 3
    1 / -0
    Touch on the right side stimulate
    Solution
    C. Left somatic sensory area
    Reason: Human brain is divided into two parts, the left cerebral hemisphere, and the right cerebral hemisphere. The left cerebral hemisphere controls the right portion of the body and the left portion is controlled by the right hemisphere. So the stimulation that arises from the touch will stimulate the left somatic sensory area and vice versa. So the correct option is C. 
  • Question 4
    1 / -0
    Metacoel is
  • Question 5
    1 / -0
    The eye ball protrudes from the orbit with the contraction of
    Solution
    Levator bulbi muscle is a thin muscle present ventrally to the eye in the orbit. It is innervated by 5th cranial nerve with the help of which the eye ball protrudes or bulges out from the orbit. It lies between the eye and roof of mouth. This muscle contracts and the buccal cavity enlarges as the eye raises.
    So, the correct answer is 'Levator bulbi muscle'.
  • Question 6
    1 / -0
    In man, abducens nerve is injured. Which one of the following functions will be affected ?
    Solution
    Abducens nerve is a motor nerve that controls the movement of the eyeball. Thus, if abducens nerve is injured, movement of the eyeball will be affected.
    Hence, the correct answer is (A)
  • Question 7
    1 / -0
    In axon of a neuron, the impulse is generated by exchange of
    Solution
    The Sodium ions flow inside and Potassium ions flow outside, causing a reversal of charges. The cell is now depolarised. This depolarization results in an action potential which causes the nerve impulse to move along the length of the axon. This depolarization of the membrane occurs along the entire nerve.
    Hence, the correct answer is (D)
  • Question 8
    1 / -0
    Conjunctiva of eye is present in
    Solution
    A. Vitreous chamber is the space between cornea and lens.
    B. Aqueous chamber is the space between cornea and lens and contains a thin watery fluid.
    C. Ciliary body is a part of eye consisting of ciliary muscles that change the shape of lens.
    D. 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.
    Conjunctiva is a thin transparent membrane lining the eyelids and present in front of cornea.
    So, the correct answer is 'Front of cornea'.
  • Question 9
    1 / -0
    At rest, the eyes have
    Solution
    Ciliary  body is composed of ciliary muscles that attach the eye ball to ligaments. Ciliary muscles contract and relax to accommodate the eye to focus on objects at different distances. Ciliary muscles change the thickness of lens. Oculomotor nerve controls the action of ciliary muscles. At rest, ciliary muscles are relaxed as light rays have to be focussed on a single point and there is no change in distance. 
    So, the correct answer is 'Relaxed ciliary body'.
  • Question 10
    1 / -0
    H-shaped grey matter is found in
    Solution
    Grey matter in the spinal cord is known as the grey column which travels down the spinal cord distributed in three grey columns that are presented in an "H" shape. The forward-facing column is the anterior grey column, the rear-facing one is the posterior grey column and the interlinking one is the lateral grey column.
    Hence, the correct answer is (A)
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