Chapter 26 Koepke Urinary System
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FlashcardsFunctions of the Urinary system
Execrete metabolic wastes and foreign substances
Regulates blood ionic composition
Regulates blood pH, volume, and pressure
RAA system activation
Cacitrol and erthropoieten production
Gluconeogenesis
What is hte functional unit of the kidney
Nephron
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16 Terms
Functions of the Urinary system
Execrete metabolic wastes and foreign substances
Regulates blood ionic composition
Regulates blood pH, volume, and pressure
RAA system activation
Cacitrol and erthropoieten production
Gluconeogenesis
What is hte functional unit of the kidney
Nephron
What is the flow of urine
Nephron, minor calyx, major calyc, renal pelvis, ureter, urinary bladder, urethra
Kidneys receive how much of resting cardiac output
20-25%
How much is renal flow
1.2 L per minute
What happens during glomeruler filtration
Water and small solutes (glucose, amino acids, ions, wastes) move into bowmans capsule and then into the renal tube
What happens during tubular reabsorbtion
Useful solutes get reabsorbed into the peritubular cappillaries like glucose and other important ions. Main location is the proximal convoluted tube but associate with peritubular capillaries
What happens during tubular secretion
More wastes, H+, and K+ are removed from the filtrate. Associate with peritubular capillaries
Which is bigger, the afferent arteriole or the efferent arteriole
Afferent arteriole is larger, this causes a net filtration pressure of 10
What hormones are involved with hormonal regulation of filtration and what do they do
Angiotensin II: decreases urine production
Atrail Natiuretic peptide: increases urine production
What type of NS stimulation decreases urine production
Sympathetic stimulation
Proximal convoluted tubule does what
Puts good stuff from filtrate back into bloodstream
65% of water, 100% of glucose and amino acids, ions like sodium chloride potassium also reabsorbed
Descending limb
15% of water reabsorbed
Ascending limb
Sodium potassium and cloride reabsorbed
Distal convoluted tubule
Stimulated by parathyroid hormone which causes reabsorbtion of calcium
Collecting duct
Stimulated by aldosterone and ADH
Reabsorbs water and sodium
Maintains pH of blood by secreting H+ ions
Secretes potassium