Locomotion and Movement Chapter-Wise Test 15

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which part of the vertebral column bears the most weight?

Cervical vertebrae
Thoracic vertebrae
Lumbar vertebrae
Sacral vertebrae
3

The lumbar vertebrae bear the most weight and provide support for the lower back.

Which type of bone cell is responsible for bone resorption?

Osteoblasts
Osteoclasts
Osteocytes
Chondrocytes
2

Osteoclasts break down bone tissue during bone remodeling and calcium regulation.

Which of the following statements about muscle contraction is correct?

ATP is not required for contraction.
Myosin heads form cross-bridges with actin filaments.
Calcium ions play no role in muscle contraction.
Actin filaments shorten during contraction.
2

Myosin heads form cross-bridges with actin filaments during muscle contraction​.

Which of the following bones is incorrectly matched with its classification?

Femur - Long bone
Humerus - Short bone
Sternum - Flat bone
Vertebra - Irregular bone
2

The humerus is a long bone, not a short bone.

Which structure in muscles stores calcium ions required for contraction?

Sarcolemma
T-tubules
Sarcoplasmic reticulum
Myosin filaments
3

The sarcoplasmic reticulum stores and releases calcium ions for muscle contraction.

Which protein helps in the regulation of muscle contraction by binding calcium?

Myosin
Actin
Troponin
Tropomyosin
3

Troponin binds calcium ions, which trigger the movement of tropomyosin to expose myosin-binding sites on actin.

Which bone is commonly referred to as the collarbone?

Scapula
Clavicle
Sternum
Humerus
2

The clavicle is a long bone that connects the shoulder blade to the sternum.

Which of the following bones belongs to the axial skeleton?

Femur
Humerus
Sternum
Scapula
3

The sternum is part of the axial skeleton, while the femur, humerus, and scapula belong to the appendicular skeleton​.

Which of the following statements about actin filaments is incorrect?

Actin filaments are composed of 'F' actin polymers.
Troponin is distributed at regular intervals on actin filaments.
Myosin binds directly to tropomyosin during contraction.
Actin filaments are thinner compared to myosin filaments.
3

Myosin does not bind directly to tropomyosin; it binds to actin filaments after troponin removes the masking effect​.

Which joint allows rotation of the head?

Ball and socket joint
Hinge joint
Pivot joint
Gliding joint
3

The pivot joint between the atlas and axis vertebrae allows head rotation.

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