Do sharks have a respiratory system?
Certainly, sharks have gills that absorb oxygen from sea water and release carbon di oxide. Sharks must keep moving even when sleeping to keep water flowing through their gills.
The respiratory system consists of the gills, gill rakers, the mouth, spiracles, gill lamellae, working together in conjunction with the circulatory system. Essentially, the goals of these systems are to absorb and circulate oxygen and other nutrients through the blood with the intention of distributing them to various parts of the body.