57. The inner mitochondrial membrane contains numerous inward folds called cristae, which greatly increase the surface area of this membrane. Because ATP is produced on the inner mitochondrial membrane, cristae enhance the ability of the mitochondria to generate ATP. What structure can be thought of as similar to these cristae? (A) Spiracle (B) Finger-like projections of a human's small intestine (C) Bronchiole (D) Cartilage