Cilia in the Respiratory System | Overview, Structure & Function - Lesson | Study.com
1. Alveoli are air sacs in the lungs where gas exchange occurs with the blood. The tissue that makes up alveoli is simple squamous epithelium, which is different than the respiratory tract
National Museum of Health and Medicine (NMHM): Visibly Human Health and Disease in the Human Body: Respiratory System
Organs and Structures of the Respiratory System | Anatomy and Physiology II
When Breathing Doesn't Come Naturally | El Camino Health