NEET UG - Locomotion and movement - skeletal system joints muscles mechanism of muscle contraction Online Test (MCQ Quiz)

1. What is the primary structural protein that forms the thin filaments in muscle cells?

A) Myosin B) Actin C) Tropomyosin D) Troponin

2. Which type of muscle tissue is characterized by voluntary control and striations?

A) Smooth muscle B) Cardiac muscle C) Skeletal muscle D) Visceral muscle

3. The 'powerhouse' of the cell, responsible for ATP production, is abundant in muscle cells. What is this organelle?

A) Nucleus B) Ribosome C) Endoplasmic Reticulum D) Mitochondrion

4. What is the functional unit of muscle contraction?

A) Sarcomere B) Myofibril C) Sarcoplasm D) Sarcolemma

5. Which ion is crucial for initiating muscle contraction by binding to troponin?

A) Sodium (Na+) B) Potassium (K+) C) Calcium (Ca2+) D) Magnesium (Mg2+)

6. The 'all-or-none' principle in muscle contraction refers to:

A) The response of a single muscle fiber to a stimulus B) The response of an entire muscle to a stimulus C) The speed of muscle relaxation D) The duration of muscle tetanus

7. What is the name of the membrane that surrounds the entire skeletal muscle?

A) Perimysium B) Endomysium C) Epimysium D) Fascicle

8. Which joint allows for the greatest range of motion, like in the shoulder and hip?

A) Hinge joint B) Pivot joint C) Ball-and-socket joint D) Saddle joint

9. What part of the vertebral column consists of five fused vertebrae?

A) Cervical vertebrae B) Thoracic vertebrae C) Lumbar vertebrae D) Sacrum

10. The sternum is also known as the:

A) Collarbone B) Shoulder blade C) Breastbone D) Rib cage

11. What is the primary role of the skeletal system?

A) Digestion of food B) Circulation of blood C) Support, protection, and movement D) Gas exchange

12. Which bones form the pectoral girdle?

A) Pelvis and femur B) Clavicle and scapula C) Sternum and ribs D) Humerus and radius

13. What connective tissue connects muscles to bones?

A) Ligament B) Cartilage C) Tendon D) Fascia

14. A decrease in muscle mass due to lack of use is termed:

A) Hypertrophy B) Atrophy C) Hyperplasia D) Dystrophy

15. The sliding filament theory explains muscle contraction by the:

A) Stretching of actin and myosin filaments B) Shortening of individual sarcomeres C) Expansion of the sarcoplasmic reticulum D) Increase in the number of myofibrils

16. Which part of a muscle cell contains the sarcoplasmic reticulum?

A) Sarcolemma B) Sarcoplasm C) Sarcomere D) Myofibril

17. What is the neurotransmitter released at the neuromuscular junction that triggers muscle contraction?

A) Dopamine B) Serotonin C) Acetylcholine D) Norepinephrine

18. What type of joint is found between the carpals and metacarpals?

A) Hinge joint B) Pivot joint C) Gliding joint D) Ball-and-socket joint

19. The elbow joint is primarily a type of:

A) Ball-and-socket joint B) Hinge joint C) Pivot joint D) Saddle joint

20. Which bone is commonly called the 'funny bone'?

A) Humerus B) Radius C) Ulna D) Clavicle

21. The skull is an example of which type of joint?

A) Hinge joint B) Ball-and-socket joint C) Suture joint D) Pivot joint

22. What is the main function of tropomyosin in muscle contraction?

A) To bind to calcium ions B) To block the myosin-binding sites on actin C) To hydrolyze ATP D) To transmit the nerve impulse

23. Muscle fatigue is often associated with the accumulation of which metabolic byproduct?

A) Oxygen B) Glucose C) Lactic acid D) ATP

24. Which part of the pelvis articulates with the femur?

A) Ilium B) Ischium C) Pubis D) Acetabulum

25. The 'red' color of skeletal muscles is due to the presence of:

A) Myoglobin B) Hemoglobin C) Actin D) Myosin

26. What is the primary protein that forms the thick filaments in muscle cells?

A) Actin B) Tropomyosin C) Myosin D) Troponin

27. Which type of joint allows for rotation around a central axis, like in the neck (atlas-axis articulation)?

A) Hinge joint B) Ball-and-socket joint C) Pivot joint D) Gliding joint

28. The 'A band' in a sarcomere represents the region where:

A) Only thin filaments are present B) Only thick filaments are present C) Thin and thick filaments overlap D) There are no filaments

29. What is the process by which a muscle fiber shortens?

A) Relaxation B) Contraction C) Tetanus D) Resting potential

30. Which of the following is NOT a component of the axial skeleton?

A) Skull B) Vertebral column C) Rib cage D) Limb bones

31. What is the term for the invagination of the sarcolemma that carries the action potential deep into the muscle fiber?

A) Sarcoplasmic reticulum B) T-tubule C) Myofibril D) M-line

32. The connection between a motor neuron and a muscle fiber is called the:

A) Synapse B) Ganglion C) Neuromuscular junction D) Axon terminal

33. Which bone articulates with the tibia and fibula to form the knee joint?

A) Femur B) Patella C) Tibia D) Fibula

34. What is the primary function of ligaments?

A) Connect muscles to bones B) Connect bones to bones C) Provide cushioning between bones D) Store calcium

35. The 'I band' in a sarcomere represents the region where:

A) Only thick filaments are present B) Only thin filaments are present C) Thin and thick filaments overlap D) There are no filaments

36. What is the substance that stores oxygen in muscle cells?

A) Hemoglobin B) Myoglobin C) Albumin D) Keratin

37. The process of muscle relaxation involves:

A) Calcium ions binding to troponin B) ATP hydrolysis C) Calcium ions being pumped back into the sarcoplasmic reticulum D) Myosin heads binding to actin

38. Which of the following is a characteristic of cardiac muscle?

A) Voluntary control and multinucleated B) Involuntary control and striated C) Voluntary control and unstriated D) Involuntary control and unstriated

39. The 'M line' is located in the center of which band in a sarcomere?

A) I band B) A band C) H zone D) Z line

40. What is the term for the connective tissue sheath that surrounds a fascicle (bundle of muscle fibers)?

A) Epimysium B) Endomysium C) Perimysium D) Sarcolemma

41. Which joint allows for flexion and extension, like in the fingers and toes?

A) Pivot joint B) Gliding joint C) Hinge joint D) Saddle joint

42. The 'Z line' or 'Z disc' marks the boundary of which functional unit?

A) Myofibril B) Sarcomere C) Sarcoplasm D) Myosin filament

43. What is the total number of bones in the adult human body?

A) 206 B) 210 C) 200 D) 220

44. Which part of the vertebral column has the largest and strongest vertebrae to support body weight?

A) Cervical B) Thoracic C) Lumbar D) Sacral

45. The 'cross-bridge cycling' in muscle contraction refers to the:

A) Binding and unbinding of myosin heads to actin B) Movement of calcium ions into the sarcoplasm C) Repolarization of the sarcolemma D) Synthesis of ATP

46. What is the primary function of the hyoid bone?

A) Forming part of the jaw B) Anchoring the tongue and providing attachment for muscles of swallowing C) Protecting the brain D) Connecting the rib cage to the sternum

47. The 'H zone' within a sarcomere is the region that:

A) Contains only thin filaments B) Contains only thick filaments C) Is where thin and thick filaments overlap D) Is bisected by the M line

48. Which of the following is a type of synovial joint characterized by opposing surfaces that are flat or slightly curved, allowing gliding movements?

A) Hinge joint B) Pivot joint C) Ball-and-socket joint D) Gliding joint

49. What is the role of ATP in muscle contraction?

A) To block myosin binding sites B) To bind to troponin C) To detach myosin heads from actin and energize them D) To transport calcium ions

50. The skeletal structure of the arm consists of:

A) Femur, tibia, fibula B) Humerus, radius, ulna C) Clavicle, scapula, humerus D) Tibia, fibula, patella

Locomotion and movement - skeletal system joints muscles mechanism of muscle contraction - Online Test

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