SELU Nursing 487 Respiratory Part 1 Exam | Questions & 100% Correct Answers (Verified) | Latest Update | Grade A+
the primary function of the lungs : Host Defense&Gas exchange Optimal gas exchange requires: : Intact nervous system, .Compliant lungs, Work of breathing, Hemodynamic/Cardiac Function Respiratory process has three distinct concepts: : VENTILATION, RESPIRATION, PERFUSION Inspiration: : Thorax enlarges and the intrapulmonary pressure decreases below atmospheric pressure. If the intrapulmonary pressure drops below that of the atmosphere, air enters the lung Expiration: 2 | P a g e : If the intrapulmonary pressure increases above atmospheric pressure, then air is pushed out of the lungs Surfactant: : lipoprotein in the alveoli (has a detergent like property) that prevents the alveoli from collapsing at the end of expiration; this decreases the tendency of the lungs to collapse; this is what is missing in premature infants and why many have to be put on vent. Compliance: : The ease of the lungs to expand: or the stretch ability of the lungs. If there is less compliance of the lungs, then it takes more pressure/force to expand the lungs. Respiration can be divided into two parts: : EXTERNAL RESPIRATION: Diffusion of gases across the alveolar capillary membranes ( occurs at the lung level) INTERNAL RESPIRATION: diffusion of gasses across the tissue and removal of the bi-product co2 at a cellular level (systemic capillary membrane) Diffusion
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