Which type of epithelial tissue is specialized for diffusion?

Correct Answer: C

Rationale: Simple squamous epithelium, a single layer of flat cells, is specialized for diffusion, as in alveoli (lungs) or capillaries, where thinness facilitates gas or nutrient exchange. Simple cuboidal focuses on secretion/absorption (e.g., kidney tubules), not primarily diffusion. Stratified squamous protects (e.g., skin), too thick for efficient diffusion. Transitional stretches (e.g., bladder), not diffusion-optimized. Simple squamous's minimal thickness and large surface area, per tissue function, make 'c' the correct choice.

Correct Answer: C

Rationale: Flat bones, like cranial bones (e.g., parietal), are thin, broad, and protective, forming the skull's vault. Long bones are limbs (e.g., femur), short bones are wrist/ankle (e.g., carpals), and irregular bones are vertebrae. Flat bones' shape and protective role, per skeletal anatomy, make 'c' correct.

Correct Answer: C

Rationale: The sternum, or breastbone, is part of the axial skeleton, anchoring ribs to protect thoracic organs. Humerus and femur are appendicular (limbs). Scapula is pectoral girdle, appendicular. Sternum's axial role, per skeletal framework, makes 'c' correct.

Correct Answer: B

Rationale: The temporal bone houses the middle ear (e.g., ossicles), facilitating hearing/balance, via its petrous portion. It protects the brain partially, but ear housing is primary. Cheekbone is zygomatic, spine support is vertebral. Temporal's auditory role, per skull, makes 'b' correct.

Correct Answer: C

Rationale: The skull is axial, not appendicular, which includes limbs and girdles (humerus , clavicle , femur ). Skull's midline role contrasts with appendicular's limb focus, per skeletal division, making 'c' correct.