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EXCRETORY SYSTEM

EXCRETORY SYSTEM. BY Mr.Anwar Amemar Soofi. Specific learning objectives. At the end of the class You must know.......... Organ of the urinary system Function of kidney,Uriary bladder,Urethra and Ureter. Name the parts of the C.S of the kidney. Name the parts of the Nephron.

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EXCRETORY SYSTEM

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  1. EXCRETORY SYSTEM BY Mr.AnwarAmemarSoofi

  2. Specific learning objectives At the end of the class You must know.......... • Organ of the urinary system • Function of kidney,Uriary bladder,Urethra and Ureter. • Name the parts of the C.S of the kidney. • Name the parts of the Nephron. • Differentiate the cortical and Juxtamedullary nephron.

  3. kidneys ureters urinary bladder urethra Organs of the Urinary System

  4. FUNCTIONS OF KIDNEY 1.Excretory 2.Homeostatic • Water balance • Electrolyte balance • Blood pressure regulation • Acid base balance 3.Endocrine. • Renin • Erythropoietin & thrombopoitin • 1,25-dihydroxycholecalciferol

  5. KIDNEY • Bean shaped • Paired organ (150gm each) • At the level of L1 to L3 • Right kidney lies little lower than Left

  6. Lateral or outer surface is convex Medial or inner surface is concave Medial surface face the vertebral column Hilus- the slit on the medial surface; For entering of Blood vessels, nerve, lymphatics & exit of ureter

  7. C.S of Kidney • Contains nephrons & connective tissues • Having two zones • Outer cortex & • Inner medulla • Inner most renal pelvis

  8. Renal pyramids Renal pelvis Renal cortex Renal capsule Ureter Renal medulla

  9. length 45 - 65mm Each kidney 1.3 million Renal corpuscle Renal tubules

  10. Nephrone • Functional unit of kidney • About 1 to 1.5millon nephrons in each kidney • Normal kidney function 1/3rd nephrons are enough

  11. Renal Tubule • Proximal convoluted tubule • Loop of Henle • Distal convoluted tubule • Collecting tubule

  12. Renal corpuscle (Glomerulus/ Malphigian) Tufts of capillaries Bowman’s capsule: Function – Filtration of plasma

  13. Cortical nephron • Juxta medullary nephron

  14. Difference between Cortical & Juxta medullary nephron Cortical nephron • Glomerulus present in superficial cortex • Loop of Henle is short • Loop of Henle extends upto outer medulla • No thin ascending limb Juxta-medullary nephron • Glomerulus present deep cortex • Loop of Henle is long • Loop of Henle extends upto tip or papillae of inner medulla • Having thin & thick ascending limb

  15. Difference between cortical & Juxta medullary nephron Cortical nephron • Efferent arteriole gives rise to only peritubular capillaries • Less role in counter current mechanism-minor role in concentration of urine • 85% of nephron Juxta medullary nephron • Efferent arteriole gives rise to peritubular capillaries and vasa recta • Important role in counter current mechanism-major role in concentration of urine • 15% of nephron

  16. Function of Kidney • Formation of urine. • It removes waste product from the body. • It maintaince the Homeostasis like • Water balance • Blood volume • Electrolyte balance • Acid base balance 4.Hemopoietic function by secretion of erythropoietin 5.Endocrine function by secretion of Renin,Erythropoietin,Prostaglandin

  17. SUMMARY

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