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Tissues Test - 34

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Tissues Test - 34
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  • Question 1
    1 / -0
    The area where the myelin sheath is absent in the nerve fibre is called ________. 
    Solution
    A nerve cell (neuron) comprises a cyton (cell body), dendrites, and a single nerve fibre or axon. Some nerve fibres have a covering of the myelin layer that insulates the axons. Nodes of Ranvier are small gaps found in such myelinated axons. They propagate the transmission of nerve impulses.
    Thus, the correct answer is option (D), 'Node of Ranvier'.

  • Question 2
    1 / -0
    The endothelium of blood vessel is composed of __________________.
    Solution
    Endothelium is made of single layer of squamous epithelial cells through which diffusion of gases takes place at the tissues and alveoli.
    Hence the correct option is B.
  • Question 3
    1 / -0
    Myelin sheath covers ____________.
    Solution
    • Axons of neurons can be either myelinated or non-myelinated. 
    • Myelin sheath is made up of proteins and fatty substances. 
    • It allows electrical impulses to transmit quickly and efficiently along the nerve cells.
    So, the correct answer is option 'B'.

  • Question 4
    1 / -0
    The muscles involved in the movement of the arm are
    Solution
    Striated muscle or skeletal muscle is the most common and widely distributed muscle tissue in the body. It forms all of the skeletal muscles, such as biceps. Striated muscle is voluntary muscle. All conscious movements of the body, including  the movement of the arm, legs, facial expressions, eye movements and swallowing are the products of the skeletal or striated muscle tissue.
    Thus, the correct answer is option B.
  • Question 5
    1 / -0
    Smooth muscles are not:
    Solution
    Correct option: D

    Explanation: 
    • Smooth muscle are involuntary muscles that shows no cross stripes under microscopic observation. It consists of narrow spindle-shaped cells with a single, centrally located nucleus.
    • It is under control of autonomic nervous system and simple in structure.
    • Thus, Smooth muscles are not multinucleated. Option D is correct.

  • Question 6
    1 / -0
    Smooth muscle fibres are
    Solution
    Correct option: B

    Explanation:
    • Smooth muscle fibres are Spindle-shaped, unbranched, non-striated, uninucleate and involuntary.
    • It is found in the walls of hollow organs like stomach, intestines and in tracts of the respiratory system.
      Thus, Option B is correct.

  • Question 7
    1 / -0
    Striped muscles have:
    Solution
    • Each striated muscle cell is long and cylindrical.
    • The striated muscle cells are multinucleated, i.e. have many nuclei.
    • These nuclei control the activities of the muscle cell. Several mitochondria are present to meet the energy requirements of these cells.
    • Thus, the correct answer is option B.
  • Question 8
    1 / -0
    The muscles immune to fatigue are:
    Solution
    Correct option: C

    Explanation:
    The muscles immune to fatigue are: Cardiac.
    • Cardiac muscle tissues occur only in heart and are controlled involuntarily.  Fibres of these muscle contain large number of mitochondria. They continuously function without being stimulated by nerve impulse and cannot get fatigued.
    • Striped muscles are voluntary muscles, capable of fast contraction. These muscles get easily fatigued due to excessive contraction. Ex- skeletal muscles. 
    • Non-striped muscles are involuntary muscles and covers the lining of the internal organs. ex- smooth muscles.
      Thus, Option C is correct.

  • Question 9
    1 / -0
    Striated muscles are:
    Solution
    A syncytium is a single cell that contains multiple nuclei. A striated muscle fibre has many nuclei and hence, it is a syncytium.
    So, the correct answer is A.
  • Question 10
    1 / -0
    Striated and voluntary muscles are found in:
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