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DIAG 2735 Chapter 22 Urine Overveiw

DIAG 2735 Chapter 22 Urine Overveiw - Excretion Excretion...

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Excretion Excretion Body systems work interdependently to maintain homeostasis by excretion Urinary Digestive Respiratory Integumentary
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Organs of the Urinary System Organs of the Urinary System Two kidneys Two ureters  Single urinary bladder Single urethra
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Male urinary  system, showing  blood vessels.   Zooming In:  What  vessel supplies  blood to the kidney?  Renal artery. What  vessel drains the  kidney? Renal vein
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Kidney Activities Excretion Urea – a product of amino acid metabolism Water balance maintenance Body fluid acid–base regulation Blood pressure regulation Renin-Angiotensin – causes blood vessels to constrict Aldosterone – causes sodium reabsorption (volume) Red blood cell production regulation
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Kidney Structure Kidney Structure Membranous renal capsule of fibrous connective tissue Adipose capsule of fat Fascia anchors kidney to peritoneum and abdominal wall Retroperitoneal space – where kidneys are located Right kidney lower than left to accommodate liver
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Blood Supply to the Kidney Renal artery supplies blood Nephrons are functional units Renal vein drains blood
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Kidney Organization Hilum - notch for artery, vein & ureter connect Renal cortex - outer portion Renal medulla - inner portion, contains tubes that collect urine Renal pyramids – cone-shaped structures Renal pelvis – funnel-shaped basin that forms at the upper end of  ureter Calyces – cup-like extensions that collect urine
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Longitudinal section through the kidney. Its internal structure is shown (left), along  with an enlarged diagram of nephrons (right). Each kidney contains more than 1 million  nephrons. 
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The Nephron
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