PHYSIOL 1 Lecture Notes - Lecture 31: Cellular Respiration, Bronchus, Vocal Folds
Document Summary
Cellular utilization of o2 in the metabolism of organic molecules (cellular respiration) Exchange of o2 and co2 between the organism and the environment (external respiration) Lungs consists mainly of tiny air sacs known as alveoli. The alveoli are connected to the environment via airways. Inspiration: moving of air into alveoli via airways. Expiration: moving air from alveoli to environment via. Air first passes through nose or mouth to enter the pharynx. Pharynx branches into esophagus (leading to stomach) and larynx (contains vocal cords) Trachea branches into two primary bronchi (right bronchus, and left bronchus) which enter lungs. Very small bronchioles may contain alveoli (respiratory bronchioles) These lead to tiny tubes with many alveoli (alveolar ducts), which eventually end in alveolar sacs. Airways without alveoli make up the conducting zone. Contain cilia and mucus to trap and remove dust and pathogens. Airways with alveoli make up the respiratory zone. Pulmonary capillaries (where gas exchange takes place-3.
