Answer: Shoulder girdle consisting of clavicle and scapula on each side; connects upper limbs to axial skeleton.
- A The pair of large hip bones that together form the structural base of the pelvis and lower limb attachment
- B Shoulder girdle consisting of clavicle and scapula on each side; connects upper limbs to axial skeleton
- C The sternum bone alone, existing without any associated shoulder bones attached to it on either side
- D The sacrum and coccyx bones located at the very base of the vertebral column itself near the pelvis
Correct answer: B. Shoulder girdle consisting of clavicle and scapula on each side; connects upper limbs to axial skeleton
Explanation: Pectoral (shoulder) girdle: clavicle (collarbone) + scapula (shoulder blade) on each side. Connects upper limb to axial skeleton. The clavicle articulates with sternum medially and scapula laterally. The glenoid fossa of scapula forms the socket for shoulder joint.
A sarcomere (Z line to Z line): during contraction the I band and H zone shorten as thin filaments slide over thick, while the A band stays the same length. Image: SlothMcCarty, CC BY-SA 3.0, via Wikimedia Commons.
Concept context
Types of movement, muscle contraction, skeletal system, joints, and disorders. Important for Class 11 and NEET.