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Tissues Test - 35

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Tissues Test - 35
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Weekly Quiz Competition
  • Question 1
    1 / -0
    Unstriped muscles are found in ____________.
    Solution
    • Unstriped muscles are smooth muscles that contract without conscious control arranged in the form of thin layers or sheets. 
    • These are made up of spindle-shaped, unstriated cells with a single nucleus and are found in the walls of the internal organs, such as the stomach, urinary bladder, intestine, and blood vessels (except for the heart). 
    • They are capable of slow rhythmic involuntary contractions.
    Thus, the correct answer is option B.
  • Question 2
    1 / -0
    In the resting muscle fibre, tropomyosin partially covers
    Solution
    When the muscle is at rest, tropomyosin prevents the interactions between thin and thick filaments. Tropomyosin is a double-helical protein that covers the active sites for myosin on the individual actin molecules, thus preventing the actin-myosin interaction necessary for the contraction of muscle.
    Thus, the correct answer is option C.
  • Question 3
    1 / -0
    Cardiac muscles have some characteristics of:
    Solution
    Correct option: C

    Explanation:
    • Cardiac muscles are striated like in skeletal muscles. 
    • And involuntary like in smooth muscles.
      Thus, It have both characteristics of skeletal and smooth muscles. Option C is correct.

  • Question 4
    1 / -0
    The muscles present in our:
    Solution
    The muscles in the upper arm and shoulder are striated muscles and not smooth muscles. Also, these are triangular in shape. So, option B is incorrect.
    Heart possesses unique muscles, called cardiac muscles, which are involuntary striated muscles. So, option C is incorrect.
    The intestinal muscles are involuntary and are smooth muscles. So, option D is incorrect.
    The muscles present in the thigh are striated and voluntary. 
    Hence, the correct answer is option A.
  • Question 5
    1 / -0
    Striped and branched muscles are found in: 
    Solution
    The heart muscles are called cardiac muscles. Cardiac muscles are involuntary, striated, branched and single nucleated.
    Thus, the correct option is B. 
  • Question 6
    1 / -0
    Which of the following tissue is multinucleated?
    Solution
    • Cardiac muscle tissue are found in the wall of the heart. These are uninucleated and lie near the centre. Each fibre is a long and cylindrical structure that has a definite sarcolemma.
    • Skeletal muscle tissue are found in the limbs, body walls. These are multinucleated. Each muscle fibre is an elongated cell surrounded by a delicate membrane sarcolemma.
    • Smooth muscle tissue are non-striated muscle. These are uninucleated and surrounded by the cytoplasm. Each fibre is enclosed by the plasma membrane.
    • So, the correct answer is option B.
  • Question 7
    1 / -0
    The structural and functional unit of the striated muscle fibre is called as
    Solution

    • The sarcolemma is the cell membrane of a striated muscle fibre cell.
    • The sarcoplasm of a muscle fibre is like the cytoplasm of other cells and it houses large amounts of glycosomes.
    • A myofibril is a basic rod-like unit of a muscle. Myofibrils comprise of repeating sections of sarcomeres. 
    • These sarcomeres appear as alternating dark and light bands under the microscope and are responsible for muscle contractions. Hence, considered the structural and functional unit of the striated muscle fibre.

    Thus, the correct answer is option B.

  • Question 8
    1 / -0
    Unstriated muscles are found in:
    Solution
    Smooth muscles are the muscle tissues that contract involuntarily (without conscious control). Unlike skeletal muscles, alternate light and dark bands are not present in smooth muscles. Hence, the term 'unstriated' is used for describing smooth muscles. Smooth muscles are found in the walls of the internal organs (except for the heart), such as the stomach, uterus, bladder, intestine, and blood vessels (veins, arteries).
    Thus, the correct answer is option D.
  • Question 9
    1 / -0
    Which of the following set clearly identifies the striated muscles?
    Solution
    Striated muscles are skeletal muscles, which appear striated when viewed under the microscope. Their cells are cylindrical, unbranched and are multinucleated (syncytial). These muscles are capable of voluntary, quick, forceful contractions.
    Thus, the correct answer is option (A)- 'Cylindrical, multinucleated and unbranched'.
  • Question 10
    1 / -0
    Hypertrophy of muscle is the condition wherein
    Solution
    Muscle hypertrophy is a term for the growth and increase of the size of the muscle cells. The most common type of muscular hypertrophy occurs as a result of physical exercise such as weight lifting.
    When someone starts exercising, there is an increase in the nerve impulses that cause muscle contraction. This results in strength gains without noticeable change in muscle size.
    As one continues to exercise, there is a complex interaction of nervous system responses, that result in an increase in protein synthesis over months and the muscle cells begin to grow larger and stronger.
    Thus, the correct answer is option B.
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