Lecture 15 - Biology 2A03 L15 Lecture 15 Kidney II Nephron...

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Biology 2A03 – L15 Lecture 15 – Kidney II Nephron Components – Blood Side 1. Essentially two capillary beds in series , joined by an arteriole = “portal system” 1. Few are in body where capillary beds are arranged in series 1. Afferent Arteriole = 1 st important site of vascular resistance control 2. Glomerulus = 1 st capillary bed, site of formation of primary urine by filtration (bulk flow of protein free plasma) 3. Efferent Arteriole = 2 nd important site of vascular resistance control 4. Pertubular Capillary Bed & Vasa Recta = 2 nd capillary bed site of reabsorption (selective transport from tubule IF) & secretion (selective transport back to tubule) 5. Filtration, reabsorption & secretion are the 3 basic processes by which the urine is formed Nephron Components – Urine or Tubule Side 1. Tubule is essentially a single winding tube along which the urine flows & gets progressively modified 2. Bowman’s Capsule = receives the primary urine by filtration from the glomerulus 3. Proximial Convoluted Tubule
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