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23 sty 2023 · Clinically, the diffusion capacity of the lung (DLCO) is measured using low concentrations of carbon monoxide. DLCO can be calculated by the equation VCO = DLCO (PACO – PaCO). PaCO is approximately zero due to hemoglobin binding so that the equation can be rearranged to DLCO = VCO / PACO.
Ventilation, diffusion and perfusion. Ventilation consists of two parts: Expiration, when the intrapulmonary pressure is higher than the atmosphere, air will flow out of the lungs. Diffusion is the process whereby gases move from an area of high pressure to low pressure.
Define respiratory rate. Outline the mechanisms behind the control of breathing. Describe the respiratory centers of the medulla oblongata. Describe the respiratory centers of the pons. Discuss factors that can influence the respiratory rate.
31 paź 2023 · Direct Diffusion. For small multicellular organisms, diffusion across the outer membrane is sufficient to meet their oxygen needs. Gas exchange by direct diffusion across surface membranes is efficient for organisms less than 1 mm in diameter.
20 lip 2023 · The lungs divide into five major lobes: three lobes on the right and two lobes on the left. Each lobe is made up of many small alveoli, which are the primary site of gas exchange. At the alveoli, diffusion of gases into the arterioles occurs.
The anatomy of the lung maximizes the diffusion of gases: the respiratory membrane is highly permeable to gases; the respiratory and blood capillary membranes are very thin; and there is a large surface area throughout the lungs.
11 lis 2020 · The amount of carbon monoxide taken up in the pulmonary circulation depends on the diffusion characteristics of the alveolar-capillary membrane, not the amount of pulmonary capillary blood flow. The uptake of carbon monoxide is said to be diffusion limited.
