What is the term 'osteon' used for?

Correct Answer: B

Rationale: Osteon (Haversian system) is a cylindrical unit in compact bone around a central canal, not cells, spongy bone, or lacunae. Answer is B, per the document.

Correct Answer: D

Rationale: The skeletal system includes all bones (206 in adults) and connective tissues (e.g., cartilage, ligaments, tendons) that link them, supporting and protecting the body. A is incomplete, B and C describe muscular or organ systems, making 'All the bones in the body and the tissues that connect them' correct.

Correct Answer: B

Rationale: Cartilage is flexible and rubbery (e.g., ear), while bone is rigid and firm due to mineralization. Bone isn’t primitive (both are ancient), and both are internal, making 'Cartilage is rubbery, and bone is firm' correct.

Correct Answer: C

Rationale: The skeletal system has several key functions: producing blood cells (hematopoiesis) in the bone marrow, storing minerals like calcium and phosphorus, and protecting vital organs (e.g., skull protects the brain, rib cage protects the heart and lungs). However, storing carbohydrates is not a function of the skeletal system; carbohydrate storage primarily occurs in the liver and muscles as glycogen.

Correct Answer: C

Rationale: The vomer is a single, midline facial bone forming part of the nasal septum. Maxillae, lacrimals, and nasals are paired bones, while the vomer is unpaired, making it the correct choice.