BPK 205 Lecture Notes - Lecture 24: Histamine, Trachea, Bronchus

• School: Simon Fraser University
• Department: Biomedical Physio & Kines
• Course: BPK 205
• Professor: Nadine Wicks

Document Summary

Functional organization and anatomy of the respiratory system. The steps of external respiration: external respiration is the movement of gases between the internal environment of the body and external environment (i. e. atmosphere) Inspiration = air moves into lungs: expiration = air moves out of the lungs, the respiratory and circulatory systems coordinate to move o2 and. Scalenes, external intercostals, and diaphragm are the only muscles used at rest: these muscles contract and the lungs expand = air flows in. During forceful breathing, other muscles are recruited. Muscles of inspiration: scalenes, diaphragm, external intercostals = used at rest, sternocleidomastoids = used during forceful breathing. Internal intercostals and abdominal muscles = used during forceful breathing. Functions: protects the lungs, pleural fluid lubricates membranes and allows them to slide against each other as lungs move with breathing, also sticks the lungs tightly to the thoracic wall.