Which of the following is NOT a type of muscle?

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: 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.

Correct Answer: D

Rationale: A spiral fracture results from twisting forces, creating a ragged, helical break (e.g., in sports injuries). Compressed fractures shorten bones, comminuted fractures shatter them, and impacted fractures involve ends driven together, making 'spiral' correct.

Correct Answer: B

Rationale: The frontal bone forms the forehead, part of the nasal cavity roof, and the superior orbit rims. The ethmoid is internal, parietal forms the sides, and sphenoid is deeper, making 'frontal' the correct answer.