extra notes test 3

extra notes test 3 - o perfusion is the process of...

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o perfusion is the process of nutritive delivery of arterial blood to a capillary bed in the biological tissue . o Poiseulle law describes the relationship b/w blood flow, pressure, and resistance . (Difference b/w the pressure at the inflow end of the vessel and the pressure at the outflow end divided by the resistance within the vessel). For resistance to fluid flow through a tube it takes into account the viscosity of the fluid, the radius of the tube’s lumen, and the length of the tube. o Coronary artery disease (CAD), also called coronary heart disease, is a condition in which plaque (plak) builds up inside the coronary arteries. These arteries supply your heart muscle with oxygen-rich blood. Three functions of the pulmonary system o (1) Ventilates the alveoli o (2) Diffuses gases into and out of the blood (Oxygen in and CO2 out) o (3) Perfuses the lungs so that the organs and tissues of the body receive blood that is rich in oxygen and low in CO2. Minute volume o Ventilatory rate (breaths/min) times amount of air per breath (tidal volume). Surfactant o A lipoprotein that has a detergent like (watery) effect that separates the liquid molecules, thereby decreasing alveolar surface tension. 4 steps of gas transport o (1) ventilation of the lung o (2) diffusion of oxygen from the alveoli into the capillary blood o (2) Perfusion of systemic capillaries with oxygenated blood o (4) Diffusion of oxygen from systemic capillaries into the cells. Haldane effect o Deoxygenated blood increases its ability to carry CO2 o Oxygenated blood has a reduced capacity for CO2
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Hypoxic pulmonary vasoconstriction is a physiological phenomenon in which pulmonary arteries constrict in the presence of hypoxia (low oxygen levels) without hypercapnia (high carbon dioxide levels), redirecting blood flow to alveoli with higher oxygen tension. o The process might at first seem illogical, as low oxygen levels should theoretically lead to increased blood flow to the lungs to receive increased gaseous exchange. However, it is explained by the fact that constriction leads to increased bloodflow to better-aerated areas of the lung, which increases the total area involved in gaseous exchange. Spirometry (meaning the measuring of breath) is the most common of the Pulmonary Function Tests (PFTs), measuring lung function, specifically the measurement of the amount (volume) and/or speed (flow) of air that can be inhaled and exhaled. Spirometry is an important tool used for generating pneumotachographs which are helpful in assessing conditions such as asthma , pulmonary fibrosis , cystic fibrosis , and
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This note was uploaded on 07/12/2011 for the course NURSING 000 taught by Professor Clark during the Spring '11 term at Alabama.

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extra notes test 3 - o perfusion is the process of...

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