Kilgore Trout, a mortician at Final Rest Funeral Home, prepares a body on Tuesday and must shave it again on Thursday. Why?

A. actin fibers: Actin is a cytoskeletal protein found within cells, not in the extracellular matrix. It supports cell shape and movement but is not part of the matrix fiber system.

B. collagen fibers: These are strong protein fibers found in the extracellular matrix and provide tensile strength.

C. reticular fibers: These are thin, branching fibers composed of collagen and form supportive networks in soft tissues like the spleen and lymph nodes.

D. elastic fibers: Composed of elastin, these fibers provide elasticity to tissues such as skin and blood vessels.

A. broken femur bone
Bone tissue has a dense matrix with calcium salts and collagen fibers, but the collagen is not typically arranged in long, parallel bundles as in tendons.

B. bullet penetrating the abdominal wall
This would damage multiple tissues, including muscle, skin, and possibly organs, but it is not specific to dense regular connective tissue with parallel collagen fibers.

C. tear in the cartilage of the knee
Cartilage (e.g., fibrocartilage in the knee) has collagen, but the fibers are not organized in parallel; it's not the classic example of this connective tissue type.

D. tear in the calcaneal tendon
Tendons are made of dense regular connective tissue, which has parallel collagen fibers providing tensile strength. A tear here directly damages this specific tissue type.