In mammals, air enters lungs through tubes called _____, which branch into smaller tubules called _____, which extend out to tiny air sacs called _____.
In mammals, air enters lungs through tubes called _____, which branch into smaller tubules called _____, which extend out to tiny air sacs called _____. trachea; bronchioles; spongy tissue >> bronchi; bronchioles; alveoli bronchi; alveoli; gills
In mammals, air enters lungs through tubes called bronchi , which branch into smaller tubules called bronchioles , which extend out to tiny air sacs called alveoli.
