Turning the palm so that the radius rotates over the ulna is __?

Correct Answer: A

Rationale: Pronation turns the palm downward or posterior, with the radius rotating over the ulna, crossing at the radioulnar joints, as in typing. Supination turns it upward. Rotation is a general term, not specific here. Elevation raises, unrelated to forearm twist. Pronation's distinct radius-ulna crossover, per forearm mechanics, makes 'a' the correct answer.

Correct Answer: C

Rationale: Stratified squamous epithelium forms the epidermis, multi-layered and keratinized, protecting against abrasion, UV, and pathogens, as skin's outer barrier. Simple cuboidal is for secretion (e.g., glands), simple columnar for absorption (e.g., gut), and transitional for stretching (e.g., bladder) none match skin's needs. Stratified squamous's tough, renewable structure, per integumentary system, makes 'c' correct.

Correct Answer: C

Rationale: Long bones, like the femur or humerus, are longer than wide, designed for support and movement via levers. Short bones are cuboidal (e.g., carpals), flat bones are thin (e.g., skull), and irregular bones are complex (e.g., vertebrae). Long bones' length-to-width ratio, per bone classification, makes 'c' correct.

Correct Answer: C

Rationale: Eight cranial bones form the skull's braincase: frontal, 2 parietals, 2 temporals, occipital, sphenoid, ethmoid. Options 10, 12, 14 (a, b, d) may confuse with facial bones (14 total), but cranial-specific is 8. This count, per skull anatomy, makes 'c' correct.

Correct Answer: A

Rationale: Facial bones include maxilla (upper jaw) and mandible (lower jaw), shaping the face (14 total). Humerus/femur are limb, scapula/clavicle are pectoral girdle, occipital/parietal are cranial not facial. Maxilla/mandible's facial role, per skull, makes 'a' correct.