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Locomotion and Movement Test - 40

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Locomotion and Movement Test - 40
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  • Question 1
    1 / -0
    Which organ in our body is protected by the bones shown in the given picture?

    Solution
    • The image shown here is of a rib cage. The human ribcage is a protective framework for our heart, lungs etc.
    • Our body has 12 pairs of ribs altogether. Seven of them are called true ribs, three pairs are false ribs and two pairs are floating ribs.
  • Question 2
    1 / -0
    Which one of the following is not a disorder of bone?
    Solution
    Atherosclerosis is not related to bone disorder. It is a condition related to arteries. Atherosclerosis is a condition where the arteries become narrowed and hardened due to a buildup of cholesterol around the artery wall. 
    Arthritis is the inflammation of joints.
    Rickets is the disease in which weak and soft bones, stunted growth, and, in severe cases, skeletal deformities can be present. It is caused by deficiency of vitamin D.
    Osteoporosis is a skeletal disorder in which bones get weak. It is caused by the deficiency of calcium and vitamin D.
    Arthritis, rickets, and osteoporosis are diseases related to the bone disorder. 
    So, the correct answer is 'Atherosclerosis'.
  • Question 3
    1 / -0
    Select the correct option for contractile proteins from the given diagram labelled as (a) and

    Solution
    Contractile proteins of muscle are actin and myosin. Actin is the main component of thin filaments and myosin is the main component of thick filaments. The given figure is of actin filament. There is usually one troponin per 6-8 actin molecules. In this, troponin (b) is attached to the protein tropomyosin (a). It is present within the groove between actin filaments. The main function of tropomyosin is to prevent contraction during relaxed condition by blocking the attachment site for the myosin crossbridge.
    Thus, the correct answer is 'a = Tropomyosin; b = Troponin.'
  • Question 4
    1 / -0
    To treat myasthenia gravis, 
    Solution
    Myasthenia gravis is a disease caused due to the antibodies produced by an immune system that blocks or destroy the receptor sites for a neurotransmitter called acetylcholine. The enzyme esterase or acetylcholine esterase break the acetylcholine and deactivates the neurotransmitter to stop muscle activation. 
    During treatment of myasthenia gravis, it is prevented by using a chemical drug acetylcholinesterase inhibitor. These acetylcholinesterase inhibitors increase the amount of acetylcholine available and so help muscle activation and contraction.
    So the correct option is 'Esterase activity is inhibited'.
  • Question 5
    1 / -0
    Appendicular skeleton includes
    Solution
    The appendicular skeleton includes the paired fins or limbs and the girdles, the braces within the body that support them. The anterior girdle is the shoulder or pectoral girdle, to which dermal and endochondral skeletal elements contribute, and that support a pectoral fin or limb. The posterior girdle is the hip or pelvic girdle, consisting of endochondral skeletal elements that support the pelvic fin or limb. 
    So, the correct option is 'Girdles and limbs'.
  • Question 6
    1 / -0
    Which of the following characteristics can be related to cartilaginous joints?
    Solution
    In cartilaginous joints, the 2 joints are joined by cartilage, either hyaline cartilage or fibrocartilage. It lacks joint cavity. It is of 2 types, synchondrosis and symphysis. In synchondrosis joints, the bones are joined by hyaline cartilage. In symphysis, the bones are joined by fibrocartilage. These joints permit slight movements. Joint between the manubrium and the sternum, intervertebral discs and the symphysis are examples of cartilaginous joints.
    Thus, the correct answer is 'All of the above.'
  • Question 7
    1 / -0
    The cytoplasm in the muscle fibre is called as
    Solution
    The cytoplasm in the muscle fibre is called as sarcoplasm. Sarcolemma is the sheath or cell membrane present around the striated muscle fibre. The cytoplasm in the nerve cells is called as neuroplasm. The cytoplasm in the nucleus of the cell is called as necleoplasm. 
    Thus, the correct answer is 'Sarcoplasm.'
  • Question 8
    1 / -0
    In the sarcoplasmic reticulum of resting muscle, Ca$$^{2+} $$ are held together by which protein?
    Solution
    In the sarcoplasmic reticulum of resting muscle, Ca2+ are held together by calmodulin. Calmodulin is also called as calcium-modulated protein, is a calcium-binding protein present in the cytoplasm. It is present in all eukaryotic cells.it's the function is to bind calcium ions in resting muscle. when the motor impulse is generated and reached to neuromuscular junctions calcium is released from calmodulin which facilitates muscle contraction.
    So, the correct answer is 'Calmodulin'.
  • Question 9
    1 / -0
    The light bands of skeletal muscles are known as
    Solution
    Skeletal muscles are also called as striated muscles. The striated appearance  is due to the repeating units of bands of the proteins, namely actin and myosin. There are dark bands and light bands that repeat along myofibrils. The dark band is called as A band or Anisotropic band and the light band is called as I band or isotropic band.
    Thus, the correct answer is 'Isotropic bands.'

  • Question 10
    1 / -0
    Which of the following proteins is found in the thick filaments of skeletal muscle?
    Solution
    A skeletal muscle is made up of different types of proteins. The thick filaments are made up of myosin while the thin filament is made up of three proteins actin, troponin, and tropomyosin. So, the correct answer is 'Myosin'.
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