Lecture 10.docx - Lecture 10 \u2013 urinary system Function o Regulates plasma ion concentrations(na K cl o Regulates blood volume and blood pressure o

Lecture 10.docx - Lecture 10 u2013 urinary system Function...

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Lecture 10 – urinary system Function o Regulates plasma ion concentrations (na, K, cl) o Regulates blood volume and blood pressure o Helps to stabilize blood ph o Prevents the loss of valuable nutrients o Eliminates organic matter/waste (urea) o Synthesizes calcitriol (active form of vitamin D) – helps absorb calcium in intestine o Prevents dehydration o Aids the live with some if its functions (detoxifying poisons) The kidneys o The right kidney Covered by the live, hepatic flexure and duodenum o The left kidney Covered by the spleen, stomach, pancreas, splenic flexure and jejunum Positioned higher than the right kidney o Both capped with the suprarenal glands Th nephron o Basic structural and functional unit of the kidney o Renal tubule: long tubular passageway o Main functions: Reabsorbs useful organic material from the filtrate Urine processing Reabsorbs more than 80% of the water from the filtrate Prevents dehydration Secretes waste into the filtrate that was missed in an earlier process Urine processing o 2 types of nephrons: Cortical nephrons 85% of the nephrons ate cortical Located in cortex Have a relatively short nephron loop Juxtamedullary nephrons 15% of the nephrons are juxtamedullary Capsule is located near the border of the cortex and the medulla The renal corpuscle o ~200um in diameter, o Produces a protein free solution: glomerular filtrate Glomerular capsule
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