CBSE Questions for Class 11 Medical Biology Locomotion And Movement Quiz 5 - MCQExams.com

The filaments of myofibril are made up of
  • Actin, troponin, tropomyosin
  • Actin, troponin
  • Myosin, troponin
  • Actin, tropomyosin
The binding of troponin to calcium in muscle cells exposes the binding site of
  • Tropomyosin
  • Myosin
  • ATP
  • ADP
  • $${P}_{i}$$
Label the correct parts of the Myosin monomer :
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  • A. Cross arm

    B. Actin binding site

    C. Head

    D. ATP binding site
  • A. Head

    B. Cross arm

    C. Actin binding site

    D. ATP binding site
  • A. Actin binding site

    B. Head

    C. ATP binding site

    D. Cross arm
  • A. ATP binding site

    B. Actin binding site

    C. Head

    D. Cross arm
Which of the following would ensure healthy joints?
  • Playing outdoor games
  • Playing indoor games
  • Eating more red meat
  • Use of massage oil
Myosin filaments are localized in
  • Z-Band
  • H-Band
  • A-Band
  • None of the above
Deposition of ______ in the joints causes gout.
  • Urea
  • Uric acid
  • Guanine
  • Ammonia
Cardiac muscles are resistant to fatigue.
  • True
  • False
Major protein in the thick filaments of skeletal muscle fiber is
  • Myosin
  • Actin
  • Tropomyosin
  • Troponin
Which of the following is the property of cardiac muscle?
  • It is involuntary muscles.
  • It is resistant to fatigue.
  • It is striated muscle.
  • All of the above.
At times ligaments and tendons are overstretched or torn. The phenomenon is 
  • Sprain
  • Dislocation
  • Fracture
  • Tension
Which of these ions are involved in muscle contraction? 
  • $$Ca^{2+}$$ and $$Mg^{2+}$$
  • $$Ca^{2+}$$ and $$Na^+$$
  • $$Na^+$$ and $$K^+$$
  • $$Mg^{2+}$$ and $$K^+$$
$${Ca}^{2+}$$ and $${Mg}^{2+}$$ ions 
  • Reduce excitability of nerves and muscles.
  • Increase excitability of nerves and muscles.
  • Conduct nerve impulses.
  • Both B and C.
Identify the joints, which are freely movable.
  • Fibrous joints
  • Symphyses
  • Synovial joints
  • Cartilaginous joints
Gastrocnemius muscles are found in
  • Fore arm
  • Chest
  • Thigh
  • Shank
Major protein in thick filaments of skeletal muscle fibre is?
  • Myosin
  • Actin
  • Tropomyosin
  • Troponin
In skeleton muscle Z-line is connected to.
  • Actin
  • Myosin
  • Tropomyosin
  • Hensen's line
Component of actin filament of a sarcomere is
  • Myosin and troponin
  • Troponin and actin
  • Actin and myosin
  • Actin, troponin and tropomyosin
Sprain is due to outstretching/pulling of
  • Muscles
  • Tendons
  • Ligaments
  • Nerves
A joint made for power is
  • Knee joint
  • Suture in cranium
  • Joint between vertebrae
  • Mandibular joint
Identify the thick myofilament from the given contractile proteins.
  • Troponin 
  • Myosin
  • Tropomyosin
  • Actin
Which one among the following is a cartilaginous joint?
  • Synchondrosis
  • Symphysis
  • Diarthrosis
  • Both A and B
The functional unit of contractile system of a striated muscle is:
  • Sarcomere
  • Z-band
  • Cross bridge
  • Myofibril
Globular protein which masks active sites on F-actin is
  • Troponin
  • Tropomyosin
  • Myosin
  • Light meromyosin
  • Heavy meromyosin
ATP-ase needed for muscle contraction is present over
  • Aetinin
  • Troponin
  • Myosin
  • Actin
Joints of skull bones are
  • Synarthrosis
  • Amiphiarthrosis
  • Hemarthrosis
  • Diarthrosis
Sutural joints are present between
  • Thumb and metatarsal
  • Humerus and radius-ulna
  • Parietals of skull
  • Glenoid cavity and pectoral girdle
Select the correct statement about disorder of muscular or skeletal system.
  • Muscular dystrophy $$\rightarrow$$ Age related shortening of muscles
  • Myasthenia gravis $$\rightarrow$$ Autoimmune disorder which inhibits sliding of myosin filaments
  • Gout $$\rightarrow$$ Inflammation of joints due to extra deposition of calcium
  • Osteoporosis $$\rightarrow$$ Decrease in bone mass and higher chances of fractures with advancing age
Which is wrongly matched?
  • Red muscle-myoglobin
  • Tendon-connective tissue
  • Troponin-fibrous protein
  • Smooth muscle-involuntary muscle
  • Myosin-contractile protein
Symphysis consists of
  • Hyaline cartilage
  • Elastic cartilage
  • Fibrocartilage
  • Synovial fluid
Bones become fragile due to
  • Arthritis
  • Osteoporosis
  • Gout
  • Myasthenia gravis
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