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Published byJacob Matthews Modified over 9 years ago
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KIDNEYS KIDNEYS KIDNEYS KIDNEYS KIDNEYS KIDNEYS KIDNEYS KIDNEYS
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What is urine? Mostly water Solutes: urea (from breakdown of protein), uric acid (from breakdown of nucleic acids), creatinine (from breakdown of creatine phosphate in muscle fibers), sodium, potassium, ammonia, NOT FOUND: glucose, proteins, rbc, hemoglobin, wbc, and bile
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ANATOMICAL PARTS REGIONS: Renal cortex: superficial Renal medulla: inner region containing renal pyramids: Apex (papilla) face the hilus (kidney indentation) renal column: between pyramids
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More parts minor calyx; major calyces – collect urine from pyramid Renal pelvis – collect urine from calyces Nephrons – filter urine from blood; microscopic URETER
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URINE FORMATION Occurs in nephrons: mostly in renal cortex Leaves through collecting ducts
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1. Glomerular filtration Water and small solutes from blood Glomerular capsule Due to high bp
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2. Tubular reabsorption Returns useful nutrients to blood Ex: water, glucose, sodium, calcium
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3. Tubular secretion Brings some substances into the urine that are not already there. Ex: ammonium ions, hydrogen, some drugs
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blood supply
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1. What is the difference between the renal cortex and the renal medulla?
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2. What part of the kidney is the hilus?
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3. What part of the kidney collects urine from a medullary pyramid?
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4. What is the function of a nephron?
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5. Which structure of the urinary system leaves the kidneys with urine?
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