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Locomotion and Movement Test - 20

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Locomotion and Movement Test - 20
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  • Question 1
    1 / -0
    Microfilaments are composed mainly of a protein called
    Solution
    • Microfilaments are ultramicroscopic, long, thin, cylindrical rods of protein filaments of about 6 nm diameter. 
    • They are composed of mainly the actin protein and have a contractile association with filamentous protein, myosin which is essential for the contraction of microfilaments.  
    Therefore, the correct answer is option A.
  • Question 2
    1 / -0
    Which of the following ions are necessary in the chemical events of the muscle contraction?
    Solution
    For the contraction of muscles, a stimulus is required. Impulse is generated when an action potential is initiated. The muscles then shorten in length and trigger the sarcoplasmic reticulum to release calcium ions into the interior of the muscle and they bind to troponin, thus causing tropomyosin to shift from the face of actin filaments, to which the myosin head need to bind to produce a contraction. Thus, Calcium plays important role in muscle contraction. Magnesium plays important role in regulation.
    So, the correct answer is option C.
  • Question 3
    1 / -0
    Which of the following acts as a shock absorber to cushion the tibia and the femur where they come together?
    Solution
    Answer is option A i.e. "Cartilage"
    Cartilage is a vertebrate skeletal connective tissue. It is an amorphous matrix and contains glycoproteins, basophilic chondroitin and fine collagen fibres.
    Between tibia and femur, cartilage helps as shock absorber, it works to help the knee move smoothly. Cartilage helps in bone to bone ligation. Cartilage is a flexible connective tissue found in many parts of the body.
  • Question 4
    1 / -0
    The type of joint between sternum and the ribs in humans is__________________.
    Solution
    Answer is option A i.e. "Cartilagenous joint"
    The joint between the first rib and the sternum is cartilaginous. It is also called as sternocostal joint. These joints allow a very small amount of movement.
    The bones of fibrous joints are joined by fibrous tissue, e.g.  sutures in the skull or the pelvis.  Fibrous joints allow no movement at all.
    The bones of synovial joints meet in a joint capsule, e.g. the knee joint where the femur and tibia meet. These joints are the most common and most moveable joints in the human body.
  • Question 5
    1 / -0
    Which is the part of pectoral girdle?
    Solution
    The glenoid cavity is a part of the shoulder girdle or pectoral girdle. It is a shallow pyriform, articular surface, which is located on the lateral angle of the scapula. The sternum, commonly known as the breastbone, is a long, narrow flat bone that serves as the keystone of the rib cage and stabilizes the thoracic skeleton. The ilium is the uppermost and largest bone of the pelvis and appears in most vertebrates including mammals and birds, but not bony fish. The acetabulum is the socket of the hipbone, into which the head of the femur fits. Thus, option A is correct.
  • Question 6
    1 / -0
    Myoglobin is found in:
    Solution
    Myoglobin is found in red fibers.
    Myoglobin contains a heme (prosthetic) group which is responsible for its main function of carrying the oxygen molecules to muscle tissues. Myoglobin can exist in the oxygen-free form, deoxymyoglobin, or in a form in which the oxygen molecule is bound, called oxymyoglobin.
    Myoglobin is an iron and oxygen-binding protein found in the muscle tissue of vertebrates for eg. mammals. It is related to hemoglobin, which is the iron and oxygen-binding protein in the blood, specifically in the red blood cells. In humans, myoglobin is only found in the bloodstream after muscle injury.
    So, the correct answer is 'Red fibers'.
  • Question 7
    1 / -0
    Sarcolemma is found over:
    Solution
    Sarcolemma is found over skeletal muscle fibre. The sarcolemma is the cell membrane of a striated muscle fiber cell. It consists of a plasma membrane, which is a lipid bilayer, and an outer coat consisting of a thin layer of polysaccharide material (glycocalyx) that contacts the basement membrane, which contains numerous thin collagen fibrils and specialized proteins such as laminin that provide a scaffold for the muscle fiber to adhere to.
    The sarcolemma generally maintains the same function in muscle cells as the plasma membrane does in other eukaryotic cells.
    Therefore, the correct answer is option B.

  • Question 8
    1 / -0
    Strongest cartilage is
    Solution
    Fibrous cartilage is the strongest kind of cartilage, because it has alternating layers of hyaline cartilage matrix and thick layers of dense collagen fibres oriented in the direction of functional stresses. This type of cartilage does not have a perichondrium as it is usually a transitional layer between hyaline cartilage and tendon or ligament. Thus, option B is correct.
  • Question 9
    1 / -0
    Ilium is a term applied to structure like
    Solution
    Pelvic girdle is the part of the appendicular skeleton. It is made up of two pelvic bone. Each pelvic bone is formed by the fusion of three primary bones known as ilium, ischium and pubis. The two pelvic bones encloses a cavity known as acetabulum
    So, the correct answer is 'Part of the pelvic girdle'
  • Question 10
    1 / -0
    Striated muscles are found in
    Solution
    Striated muscle plays an integral role in the formation of the structural framework of the body. It is the only muscle tissue under the direct conscious control of the cerebral cortex of the brain and hence is the voluntary muscle. All conscious movements of the body, including movement of limbs like the movement of arm, legs, facial expressions, eye movements, and swallowing are the products of the skeletal muscle tissue.
    So, the correct answer is option C.
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