The bones of the forearm (radius and ulna) are part of which skeletal division?

Correct Answer: B

Rationale: The radius and ulna, forearm bones, are part of the appendicular skeleton, which includes the limbs and girdles. They are long bones but belong to the appendicular division, not axial. 'Long bones' is a type, not a division, making 'Appendicular skeleton' correct.

Correct Answer: B

Rationale: The human body has three muscle types: smooth (involuntary, in organs), cardiac (involuntary, in the heart), and skeletal (voluntary, attached to bones). 'Rough muscle' is not a recognized category in anatomy; it may confuse with muscle texture but isn’t a type, making 'rough muscle' the correct answer for what is NOT a muscle type.

Correct Answer: D

Rationale: A long bone includes the diaphysis (shaft), epiphysis (ends), and medullary cavity (marrow space). The perichondrium is a cartilage membrane, not part of mature long bones (which have a periosteum instead), making 'perichondrium' the correct answer for what is NOT included.

Correct Answer: B

Rationale: Hematopoiesis is the process of blood cell formation, occurring in red bone marrow. Endochondral and intramembranous ossification form bones, and remodeling reshapes them, making 'hematopoiesis' the correct answer.

Correct Answer: B

Rationale: Osteoblasts are cells that synthesize bone matrix, forming new bone tissue. Osteoprogenitor cells are precursors, osteocytes maintain bone, and osteoclasts resorb it, making 'osteoblasts' the correct answer.