44 10 filtraon capillary filtrate excretory tubule

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Unformatted text preview: e derived from body fluids •  Key func=ons of most excretory systems: –  Filtra+on: pressure- filtering of body fluids –  Reabsorp+on: reclaiming valuable solutes –  Secre+on: adding toxins and other solutes from the body fluids to the filtrate –  Excre+on: removing the filtrate from the system Fig. 44- 10 Filtra+on Capillary Filtrate Excretory tubule Reabsorp+on Secre+on Urine Excre+on Structure of the Mammalian Excretory System •  paired kidneys •  Each kidney is supplied with blood (waste) by a renal artery and drained by a renal vein (clean) •  Urine exits each kidney through a duct called the ureter •  Both ureters drain into the urinary bladder, and urine is expelled through a urethra Fig. 44- 14 Renal medulla Posterior vena cava Renal artery and vein Aorta Renal cortex Kidney Renal pelvis Ureter Urinary bladder Urethra Ureter (a) Excretory organs and major associated blood vessels Juxtamedullary nephron Sec+on of kidney from a rat (b) Kidney structure Cor+cal nephron 10 µm Afferent arteriole from renal artery SEM 4 mm Glomerulus Bowman’s capsule Proximal tubule Peritubular capillaries Renal cortex Efferent arteriole from glomerulus Collec+ng duct Renal medulla To renal pelvis (c) Nephron types Branch of renal vein...
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