Assistant Laboratory Animal Technician (ALAT) Practice Exam

Inhalant anesthetics are generally not used for euthanasia of which species due to their ability to hold their breath for long periods?

1. Mammals

2. Amphibians and reptiles

3. Birds

4. Fish

The correct answer is: Amphibians and reptiles

Inhalant anesthetics are generally not used for euthanasia in amphibians and reptiles primarily because these species possess the capability to hold their breath for extended periods. This allows them to remain conscious and aware even in situations where inhalant agents might be administered. The physiological adaptations of amphibians and reptiles, such as their ability to respire through their skin or slower metabolic rates, make them less susceptible to the effects of inhalant anesthetics compared to other animals. In contrast, mammals, birds, and fish do not share this specific ability to the same extent, which makes inhalant anesthetics more effective for euthanasia in those groups. In mammals, the respiratory system is more reliant on continuous breathing, while birds may require different methods due to their unique respiratory physiology. Fish may also be less tolerant of prolonged exposure to inhalants, making the choice for euthanasia more straightforward in those cases. Understanding these physiological differences is essential in zoological and laboratory practices to ensure humane treatment during euthanasia procedures.