What is the skeletal system?

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: 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.

Correct Answer: C

Rationale: Paranasal sinuses are air-filled cavities in the frontal, ethmoid, sphenoid, and maxilla bones, reducing skull weight and resonating sound. The vomer, a thin midline bone in the nasal septum, lacks a sinus.

Correct Answer: D

Rationale: The os coxa (hip bone) comprises the ilium, ischium, pubis, acetabulum (socket), and obturator foramen. The capitulum is a feature of the humerus, not the os coxa.