Locomotion and Movement Chapter-Wise Test 17

Correct answer Carries: 4.

Wrong Answer Carries: -1.

What is the major function of actin in muscle contraction?

Acts as a neurotransmitter
Provides energy for contraction
Forms thin filaments that interact with myosin
Stores calcium ions
3

Actin filaments interact with myosin during muscle contraction, leading to movement.

Which structure anchors myosin filaments in a sarcomere?

Z-line
M-line
H-zone
I-band
2

The M-line anchors myosin filaments in the center of the sarcomere.

Which structural protein helps muscle fibers return to their resting length after contraction?

Titin
Actin
Myosin
Collagen
1

Titin is an elastic protein that allows muscle fibers to return to their resting state after contraction.

Which of the following is a characteristic feature of synovial joints?

Presence of a fibrous capsule
Absence of a joint cavity
Limited movement
Direct fusion of bones
1

Synovial joints are characterized by a fibrous capsule that encloses the joint cavity, allowing free movement.

Which ion is necessary for the transmission of nerve impulses to muscles?

Potassium
Sodium
Calcium
Magnesium
3

Calcium ions are required for the release of neurotransmitters at the neuromuscular junction.

Which muscle is responsible for the movement of the diaphragm during respiration?

Intercostal muscles
Rectus abdominis
Diaphragm muscle
Oblique muscles
3

The diaphragm muscle contracts and relaxes to facilitate breathing by altering thoracic cavity volume.

Which of the following bones is a part of the pectoral girdle?

Humerus
Scapula
Femur
Tibia
2

The scapula (shoulder blade) is part of the pectoral girdle, which connects the upper limb to the axial skeleton.

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

Sternum
Femur
Ribs
Vertebrae
2

The femur is a part of the appendicular skeleton, while the sternum, ribs, and vertebrae are part of the axial skeleton​.

Which of the following bones articulates with the humerus at the shoulder joint?

Clavicle
Scapula
Sternum
Radius
2

The scapula forms the shoulder joint by articulating with the humerus.

Which part of the skeletal system protects the spinal cord?

Cranium
Vertebral column
Rib cage
Pelvic girdle
2

The vertebral column encloses and protects the spinal cord while providing structural support.

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