PHYSIOL 201 Chapter Notes - Chapter 18: Gas Exchange, Globin, Hemoglobin
27 Feb 2019
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Overview of link between respiratory & cardiovascular systems: exchange i: ventilation. Inspiration and expiration: bulk flow of air in/out of lungs, breathing leads to bulk flow movement of air into and out of the lungs. In the blood, o2 is transported either dissolved in plasma or bound to the heme group of hemoglobin. Co2 is transported either dissolved in blood, bound to the globin peptide of hb or as hco3-. O2 diffuses down its concentration gradient out of the blood into the isf and then cells. Co2 diffuses down its concentration gradient out of the cells into the isf and then into the blood. For forced expiration, the abdominal muscles and internal intercostal muscles of the ribs contract. Airway branching: the airways branch from the 1 trachea. Right and left main bronchi bronchi. Respiratory bronchioles alveolar ducts alveoli: trachea and bronchi have cartilage lining their walls. Cartilage provides support and maintains their cylindrical shape and large diameters.
