Final answer:
The component that is part of an active gas disposal system but not part of a passive system is the vacuum system. Active scavenging systems use a vacuum to pull gases away, unlike passive systems that rely on positive pressure from exhalation.
Step-by-step explanation:
The question revolves around the different components of scavenging systems, particularly contrasting active gas disposal systems versus passive systems. Scavenging systems are used in medical settings to collect and remove excess anesthetic gases from operating rooms thereby protecting healthcare workers and patients from potential exposure. In an active scavenging system a vacuum system is used to actively pull excess gases away from the anesthesia workstation and out of the operating room.
This is in contrast to a passive system, which relies on the positive pressure created by the patient's exhalation to push gases through the scavenging system and into a disposal area. Therefore, the correct answer to the question "Which part listed below is part of an active gas disposal system but not part of a passive system?" is D) Vacuum system. Given that the flow-through respiratory system mentioned in the reference provided is more related to animal physiology and is not part of the scavenging system context it seems like unrelated information and does not directly correlate to the response needed for the question about active versus passive scavenging systems.