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Locomotion and Movement Test - 47

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Locomotion and Movement Test - 47
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  • Question 1
    1 / -0
    The cross bridges in a myofibril, arise in the heads of................ molecule.
    Solution
    • Sarcomeres are composed of thick filaments and thin filaments. The thick filaments lie at the center of the sarcomere and overlap the thin filaments. The thick filaments are comprised of an elongated protein, called myosin. 
    • Each myosin molecule is shaped like a golf club, with the head of the golf club pointed out from the surface of the thick filament. 
    • This structure forms the cross-bridge, that binds to the thin filament.
  • Question 2
    1 / -0
    The vestige of the tail is made up of four fused bones. They are known as
    Solution
    The human coccyx, or tail bone, is a group of four or five small vertebrae fused into one bone at the lower end of our vertebral column. The coccyx is a vestige of a tail left over from our monkey-like ancestors.
    So, the correct answer is 'Coccyx.'
  • Question 3
    1 / -0
    An acromian process is characteristically found in the
    Solution
    • The appendicular skeleton has two main girdles: pectoral girdles and pelvic girdles. 
    • The acromion process is a bony process on the scapula or shoulder blade and together with the coracoid process, it extends over the shoulder joint. 
    • Thus the acromion process is found in the pectoral girdle of the mammals which consists of the clavicle and scapula. 

    So, the correct answer is option C.
  • Question 4
    1 / -0
    The further treatment of fibres with saturated salt solutions removes actin and its two associated proteins tropomyosin and troponin and also destroy the I-bands. This shows that the thin filaments are made up of................. proteins.
    Solution
    Muscles are composed of muscle fibres containing myofibrils, which are composed of myofilaments. There are cross-striations on the myofibrils as repeating units which are called sarcomeres which contain anisotropic and isotropic bands. The myofilaments being proteinaceous are either thick or thin filament. The thick filaments are made up of myosin molecules, while the thin filament contains three protein molecules- actin, troponin and tropomyosin. Hence when the muscle fibres are treated with saturated salt solutions, it destroys the I-bands and removes actin and its associated proteins.
    Thus, the correct answer is option C. 
  • Question 5
    1 / -0
    The H-zone in the skeletal muscle fibre is due to
    Solution
    A light area present in the center of the sarcomere is called as the H band. This area represents the portion of the A band, that contains myosin thick filaments, but no thin actin filaments. Thus, thin actin filaments extend from the Z line to the edge of the H band and overlap a portion of the thick filament in the A band. 
  • Question 6
    1 / -0
    Which of the following is an immovable joint?
    Solution
    • An immovable joint is an articulation between bones in which no movement occurs. It is also called a synarthrosis joint.
    • It is of three types. They are sutures, syndesmosis, and gomphosis.
    • Sutures are found between the bones of the skull, syndesmosis is the joint of the tibia and fibula in the ankle, and gomphosis between the root of a tooth and the sockets in the maxilla or mandible.
    • Hence Synarthrosis is an immovable joint.
    • So, the correct answer is 'Synarthros'.
  • Question 7
    1 / -0
    Volkman's canals occur in _______.
    Solution
    Volkman's canals are small channels in the bone that are at obtuse angles to the haversian canals and transmit blood vessels from the periosteum into the bone and also communicates haversian canals.
    So, the correct answer is 'Bone'.
  • Question 8
    1 / -0
    The articulation of atlas, the first vertebrae facilitates
    Solution
    The atlas bone is the first ( C1) of the seven cervical vertebrae which support the skull. The atlas does not have a body or spinous processes and is a bony ring made up of anterior and posterior arches and two lateral masses. On the surface of the atlas bone is a pair of concave faucets which articulate with rounded condyles on the underside of the occipital bone which allows for the nodding and rotatory motion.
  • Question 9
    1 / -0
    The contraction of one of the muscle rotates the forearm to turn the palm downward or backward. Identify the muscle from the following.
    Solution
    The pronators are muscle of the human body (located in the forearm), that pronates the forearm (turning it so that the palm faces posteriorly from the anatomical position). Flexor is a muscle, which causes bending of the forearm towards upper arm by biceps. Extensor is the muscle which causes straightening of bend forearm. 
  • Question 10
    1 / -0
    If the skeletal muscle fibres are soaked and treated with high concentration of salts, large quantities of proteins are removed. The fibres can no longer contract and the A-bands disappear. This shows that
    Solution
    The muscle fibre is composed of many myofibrils, which consist of thick and thin filaments (myofilaments). The special arrangement of these and the bands of myofibrils give the fibre a striated appearance under a microscope. The filaments consist almost entirely of the myofibular proteins actin (thin 20 to 25 percent) and myosin (thick 5055 percent). They are mainly responsible for the muscles ability to retain water and bind added water (water-holding capacity).
    Therefore, the correct answer is option C.
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