The Appendicular skeleton is comprised of bones.

Correct Answer: A

Rationale: The appendicular skeleton includes the pectoral girdles (4 bones), upper limbs (60 bones), pelvic girdle (2 bones), and lower limbs (60 bones), totaling 126 bones. The axial skeleton has 80 bones, making 100 and 110 incorrect estimates.

Correct Answer: A

Rationale: The mandible (lower jaw) is the only movable bone of the skull, articulating at the temporomandibular joint for actions like chewing. The hyoid, while in the neck, is not part of the skull and doesn’t move in the same context.

Correct Answer: B

Rationale: The vertebral arch, posterior to the body, consists of two pedicles (attaching to the body) and two laminae (flat plates forming the arch’s roof). Processes (e.g., spinous, transverse) project from the arch but are not its core components.

Correct Answer: B

Rationale: The scapula (shoulder blade) is triangular, with a broad base superiorly and an apex inferiorly, optimizing muscle attachment and shoulder mobility. It’s neither rectangular nor square.

Correct Answer: A

Rationale: The thumb (digit 1) has two phalanges (proximal and distal), unlike the other fingers (digits 2–5), which have three (proximal, middle, distal), due to its unique structure for opposition.