44 14b renal medulla renal cortex renal pelvis ureter

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Unformatted text preview: Loop of Henle Distal tubule Collec+ng duct Descending limb Ascending limb (d) Filtrate and blood flow Vasa recta Fig. 44- 14ab Renal medulla Posterior vena cava Renal artery and vein Aorta Renal cortex Kidney Renal pelvis Ureter Urinary bladder Urethra (a) Excretory organs and major associated blood vessels Ureter (b) Kidney structure Sec+on of kidney from a rat 4 mm Kidneys •  Kidneys: func=on in both excre=on and osmoregula=on –  principal site of water balance and salt regula=on –  has two dis=nct regions: an outer renal cortex and an inner renal medulla Fig. 44- 14b Renal medulla Renal cortex Renal pelvis Ureter (b) Kidney structure Sec+on of kidney from a rat 4 mm •  Nephron: func=onal unit of the kidney, consists of a single long tubule and a ball of capillaries called the glomerulus •  Bowman’s capsule surrounds and receives filtrate from the glomerulus Fig. 44- 14c Juxtamedullary nephron Cor+cal nephron Renal cortex Collec+ng duct To renal pelvis (c) Nephron types Renal medulla Fig. 44- 10 Filtra+on Capillary Filtrate Excretory tubule Reabsorp+on Secre+on Urine Excre+on Fig. 44- 14d 10 µm Afferent arteriole from renal artery SEM Glomerulus Bowman’s capsule Proximal tubule Peritubular capillaries Efferent arteriole from glomerulus Branch of renal vein Loop of Henle (d) Filtrate and blood flow Distal tubule Collec+ng duct Descending limb Ascending limb Vasa recta Filtra=on •  Blood flows into capillaries of glomerulus under pressure •  Waste fluid: filtrate diffuses into Bowman’s capsule and into tubules –  contains salts, glucose, amino acids, vitamins, nitrogenous wastes,...
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