Locomotion and Movement
Test 8

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following disorders is caused by the autoimmune destruction of neuromuscular junctions?

Muscular dystrophy
Myasthenia gravis
Osteoporosis
Gout
2

Myasthenia gravis is an autoimmune disorder that leads to muscle weakness due to the destruction of acetylcholine receptors at neuromuscular junctions.

Which part of the skeletal system forms the major supporting framework of the body?

Appendicular skeleton
Axial skeleton
Pectoral girdle
Pelvic girdle
2

The axial skeleton, consisting of the skull, vertebral column, and rib cage, forms the main structural framework of the body.

Which ion is essential for triggering muscle contraction?

Sodium
Potassium
Calcium
Magnesium
3

Calcium ions bind to troponin, causing a conformational change that allows actin-myosin interaction for muscle contraction.

Which of the following statements about myosin filaments is correct?

Myosin filaments are thinner than actin filaments.
Myosin filaments contain ATPase activity.
Myosin does not form cross-bridges with actin.
Myosin filaments are composed of tropomyosin.
2

Myosin filaments contain ATPase activity, which helps in ATP hydrolysis for muscle contraction​.

Which of the following bones is a part of the appendicular skeleton?

Sternum
Vertebra
Scapula
Ribs
3

The scapula is part of the appendicular skeleton, whereas the sternum, vertebrae, and ribs belong to the axial skeleton​.

Which disorder is incorrectly matched with its cause?

Osteoporosis - Decreased estrogen levels
Gout - Uric acid accumulation
Tetany - Excess calcium in body fluids
Arthritis - Joint inflammation
3

Tetany is caused by low calcium levels in body fluids, not excess calcium​..

Which of the following movements is an example of abduction?

Lifting the arm sideways
Bringing the arm towards the body
Bending the knee
Rotating the wrist
1

Abduction is the movement away from the midline of the body, such as lifting the arm sideways​.

Which type of muscle fibers are fatigue-resistant and specialized for endurance activities?

White muscle fibers
Fast-twitch muscle fibers
Red muscle fibers
Smooth muscle fibers
3

Red muscle fibers have high myoglobin content and numerous mitochondria, making them fatigue-resistant and ideal for endurance activities.

Which joint in the human body is an example of a pivot joint?

Hip joint
Shoulder joint
Joint between atlas and axis
Elbow joint
3

The joint between the atlas and axis vertebrae allows rotational movement, characteristic of a pivot joint.

Which connective tissue structure prevents friction between bones at joints?

Tendon
Ligament
Cartilage
Synovial fluid
4

Synovial fluid lubricates the joints, reducing friction and ensuring smooth movement.

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