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What is Waterfall effect is seen in which pa of lung? and explain in detail?
Water fall effect describes blood flow in the middle poion of lung. Middle poion of lung: Blood flows in pulses. Initially - No flow due to of obstruction at the collapsed venous end of the capillary Pressure from the aerial side builds up until it exceeds alveolar pressure and flow resumes-Dissipates the capillary pressure- Returns to the sta of the cycle. The blood flow in this region is determined by the pulmonary aery-alveolar pressure difference. Blood "falls" into the pulmonary veins, which are compliant and take whatever amount of blood can flow into them. This has been called the waterfall effect.