A secondary immune response is more rapid than the primary response and results in higher antibody levels

A. Usually the wounds that undergo secondary intention are infected: Many wounds that heal by secondary intention are contaminated or have tissue loss that predisposes to infection (e.g., ulcers, abscess cavities).
B. Secondary intention would take place for a severe burn: Extensive burns with tissue loss typically heal by secondary intention (granulation and contraction).
C. Wound with irregular margins would undergo secondary intention: If edges cannot be approximated (irregular margins), the wound heals by secondary intention.
D. All are true: Each of the above statements accurately describes features of wounds that heal by secondary intention.

A. continually divide throughout life: This describes labile cells (e.g., epithelial cells of skin, GI tract) - not facultative mitotic cells.
B. kidney cells are facultative mitotic cells: Many renal epithelial cells (e.g., tubular cells) are stable/facultative - they do not constantly divide but can re-enter the cell cycle after injury.
C. replaced by fibrous scarring after trauma: If injury is severe and regeneration fails, even facultative cells may be replaced by scar tissue, but this is not the defining property of facultative mitotic cells.
D. divide when required: Correct description of facultative (stable) cells - they remain quiescent normally but divide when needed (e.g., after injury).
E. Two answers are correct: Both B and D are correct statements about facultative mitotic cells.
F. None are correct: Some choices (B and D) are correct.