BIO 211 Lecture Notes - Lecture 13: Dorsal Respiratory Group, Ventral Respiratory Group, External Intercostal Muscles
1 Dec 2020
School
Department
Course
Professor
Document Summary
Unloading of o2 and loading of co2 at the systemic capillaries. Carbonic anhydrase in rbc catalyzes: co2 + h2o h2co3 hco3. Chloride shift: keeps reaction proceeding, exchanges hco3, h+ binds to hemoglobin for cl- H+ binding to hbo2 reduces its affinity for o2 tends to make hemoglobin release oxygen: hbo2 arrives at systemic capillaries 98% saturated, leaves 75% saturated . Venous reserve oxygen remaining in the blood after it passes through the capillary beds. Reactions that occur in the lungs are reverse of systemic gas exchange: co2 unloading. As hb loads o2 its affinity for h+ decreases, h+ dissociates from hb and binds with. Hco3: co2 + h2o h2co3 hco3. Reverse chloride shift: hco3 diffuses back into rbc in exchange for cl-, free co2 generated diffuses into alveolus to be exhaled. Inspiratory centre - dorsal respiratory group (drg) innervate external intercostal muscles and diaphragm.
