lecture24_Renal1

lecture24_Renal1 - Renal Physiology I Reading Chapter 14...

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Renal Physiology I Reading : Chapter 14
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Urinary System - major role is to regulate the volume, electrolyte composition, and pH of the internal environment - consists of: 1) 2) 3) 4) pair of kidneys pair of ureters urinary bladder urethra
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Specific functions served by the kidneys include: 1) 2) 3) 4) 5) 6) 7) 8) 9) 10) Maintaining H 2 O balance in the body Regulating the quantity and concentration of most extracellular (ECF) fluid ions Maintaining proper plasma volume Helping maintain proper acid-base balance of the body Maintaining the proper osmolarity of body fluids Excreting the end products of bodily metabolism such as urea and uric acid Excreting foreign compounds such as drugs, food additives, pesticides Secreting erythropoietin, a hormone that stimulates red blood cell production Secreting renin, a hormone important in salt conservation by the kidneys Converting vitamin D into its active form
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Blood - large quantities of blood enter and leave the kidneys each day - enters the kidneys - - exits the kidneys - via the renal artery (connected to the aorta) via the renal vein (connected to the inferior vena cava)
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The nephron - is the functional unit of the kidney - - functional unit is the smallest unit capable of performing all of the tasks of an organ each kidney contains about 1 million nephrons
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Each nephron - consists of a 1) Vascular component 2) Tubular component - Afferent arteriole (brings blood to the glomerulus) - - - Glomerulus (tuft of capillaries that filters plasma into the tubular component) Efferent arteriole (carries blood from the Glomerulus; only arteriole in body post capillary) Peritubular capillaries (supply the renal tissue; involved with exchanges with tubular lumen) - Bowman’s capsule (collects the glomerular filtrate)
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lecture24_Renal1 - Renal Physiology I Reading Chapter 14...

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