PLN 203 Lecture Notes - Lecture 14: Pulmonary Circulation, Circulatory System, Respiratory Minute Volume

• School: Ryerson University
• Department: Physiology
• Course: PLN 203
• Professor: Nick Bellissimo

Document Summary

Respiratory system: cells produce energy (maintenance, growth, and division, through mechanisms that use oxygen and produce co2. From the air by diffusion across delicate exchange surfaces of lungs: carried to cells by cv system, also returns co2 to lungs. Functions of respiratory system: extensive gas exchange surface area b/w air and blood, moves air to and from exchange surfaces of lungs, protects respiratory surfaces from outside env, produces sounds, participates in olfactory sense. Organizations of the respiratory system: divided into, upper respiratory system above larynx. Respiratory tract: conducting portion nasal cavity to the terminal bronchioles, respiratory portion respiratory bronchioles and alveoli, alveoli air-filled pockets within the lungs where gas exchange takes place. For gases to exchange efficiently: alveoli walls must be very thin (<1um, surface area must be very great (35x surface area of body) Respiratory mucosa: consists of an epithelial layer and areolar layer called the lamina propria lining conducting portion.