40. Circulatory System
Circulatory and Respiratory Anatomy
1:15 minutes
Problem 8a
Textbook Question
Textbook QuestionWhat do the alveoli of mammalian lungs, the gill filaments of fish, and the tracheal tubes of insects have in common? a. use of a circulatory system to transport gases b. respiratory surfaces that are infoldings of the body wall c. countercurrent exchange d. a large, moist surface area for gas exchange
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