chapter 15: Urinary System

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  1. Function of urinary system
    • eliminate, nitrogenous wastes and toxins
    • regulating and maintaining homeostasis
    • H20 balance
    • electrolytes
    • acid-base balance in blood
    • blood press. 
    • RBC production
    • Vitamin D Activation
  2. Urinary system Organs
    • kidneys
    • ureters
    • urinary bladder
  3. where is the kidney located?
    • retroperitoneal - between posterior body wall and left parietal peritoneum
    • at level T12 to L3 of vertebrae
  4. kidney structure
    • renal hilum = medial indented rgn. where ureters, renal blood vessels, and nerves enter/exit
    • adrenal gland - endocrine gland is superior to each kidney
    • fibrous capsule - outer covering of kidney
  5. 3 regions of kidney
    • renal cortex - outer region
    • renal medulla - inner regiorenal pelvis = medial rn. with funnel like tubes containing calyces - cup shaped extensions of renal pelvis
  6. arterial blood supply
    abdominal aorta --> renal artery 00> segmental artery --> interlobar artery --> arcuate artery --> coritcal radial --> afferent arteriole --> glomerulus --> efferrent arteriole --> peritubular
  7. venous blood flow
    • peritublar capillaries --> cortical radiate vein --> arcuate vein --> interlobar vein --> renal vein --> inf. vena cava
    • no segmental vein
  8. nephrons
    functional units of kidneys = produce urine containing two structures 1) renal corpuscle, 2) renal tubule
  9. Renal corpuscle
    • made up of glomerulus - knot of capillaries voered with podocytes
    • glomerular (bowman's) capsule - surrounds glomerulus
  10. renal tubule
    • starts at glomerular capsule ends at collecting duct with sections of renal tubule in order
    • glomerular bowman's capsule
    • proximal convulated tubule
    • nephron loop
  11. nephron types
    • cotrical nephrons = most nephrons in cortex
    • juxtamedullary nephrons - nephron loop dips into medulla
  12. urine flow
    collecting ducts get urine from both nephron types
  13. 2 capillary beds in each nephron
    glomerulus and peritubular capillaries
  14. glomerulus
    • function - filtration
    • afferent arteriole = O2 rich blood into glomerulus
    • efferent arteriole = O2 rich blood exits glomerulus
    • high press. in glomerulus due to narrower efferent arteriole
  15. function of peritubular capillaries
    • O2 + CO2 exchange
    • low pressure of capillaries clings close to renal tubule to reabsorb substances
    • draining of interlobar veins

Card Set Information

Author:
tanyalequang
ID:
320281
Filename:
chapter 15: Urinary System
Updated:
2016-05-19 14:32:58
Tags:
bio250
Folders:
anatomy and physiology
Description:
quickly, memorize
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