Answer: Skull, vertebral column, and ribcage (80 bones).
- A Limb bones of the arms and legs mainly
- B Skull, vertebral column, and ribcage (80 bones)
- C Mainly the skull and its associated facial bones
- D Pectoral and pelvic girdles that attach the limbs
Correct answer: B. Skull, vertebral column, and ribcage (80 bones)
Explanation: The axial skeleton (80 bones) forms the central axis: skull (22 bones), vertebral column (26 bones), sternum (1) and ribs (24). The appendicular skeleton (126 bones) includes the limbs and girdles.
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.