[Campbell Biology P.46] Based on the text's discussion of diverse animal breathing mechanis... | Practice Question
Based on the text's discussion of diverse animal breathing mechanisms, which of the following statements about gas exchange adaptations are correct?
A: Mammals primarily utilize negative pressure breathing, where lung volume changes due to diaphragm and rib muscle contractions create a pressure gradient for air movement.
B: Birds possess a highly efficient respiratory system with unidirectional airflow through their lungs, supported by air sacs, allowing for continuous gas exchange.
C: Amphibians commonly use positive pressure breathing, where they force air into their lungs by contracting the floor of their mouth and throat.
D: Insects rely on their open circulatory system to transport oxygen directly to their tissues, eliminating the need for a specialized respiratory surface like lungs or gills.
Explanation
The text highlights specific breathing mechanisms for mammals, birds, and amphibians. Mammals use negative pressure breathing, birds have unidirectional airflow with air sacs, and amphibians typically use positive pressure breathing. Insects, however, utilize tracheal systems for direct gas exchange, with their hemolymph not being the primary oxygen transporter.