8 Respiratory System (pt 2)
Objective
- Gas Exchange in the Lungs and Tissues
- Transport of Oxygen in the Blood
- Transport of Carbon Dioxide in the Blood
- Role of Respiratory System in Acid Base Balance
Interactive Activities
Critical Thinking Questions
Learning Summary
- Pulmonary Circulation is the system of transportation that shunts de-oxygenated blood from the heart to the lungs to be re-saturated with oxygen before being dispersed into the systemic circulation.
- O2 enters alveoli and CO2 leaves alveoli by bulk flow of air during ventilation.
- Respiratory Membrane provides large surface area for diffusion.
- Partial Pressure of Gases is a gas is often a mixture of more than one molecule.
- Diffusion of gases is the process whereby gaseous atoms and molecules are transferred from regions of relatively high concentration to regions of relatively low concentration.
- Hemoglobin: binding and releases depends on P o2 in surrounding fluid.
- Actives tissues produce more acid; pH decreases in tissues.
- Carbonic anhydrase is catalyst for conversion of CO2 and water to carbonic acid.
- Chloride Shift is a result – most of CO2 in blood is transported as bicarb ions in the plasma.
- Hemoglobin functions as a buffer because it can bind an release hydrogen ions.
- Bicarbonate ions also acts as major buffering component of blood.
