Download Urinary System

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Organs of the Urinary System
Organs of the Urinary System
Kidneys – filter blood to produce
urine
Ureters – drain urine from kidneys
Bladder – temporary storage for urine
Trigone – between 3 holes
Urethra – carries urine out of body
Internal & external sphincters
Urinary Bladder
Organs of the Urinary System
Kidney
Covered in fat and anchored with
connective tissue
Connected to abdominal aorta by
renal artery
Connected to inferior vena cava by
renal vein
ADD Renal artery & vein to drawing!
Kidney – Internal Structure
Renal pelvis – cavity in center
collects urine
Types of tissue around pelvis
 Renal medulla found in pyramids
 Renal cortex found outside of
pyramids and in columns
Area = renal column
Area = Pyramid
Type of tissue
Kidney – Internal Structure
Nephron – functional unit of kidney
Urine formation
Overlaps medulla & cortex
Over 1 million in each kidney
Calyx – directs urine from nephrons
to renal pelvis
ADD Calyces to picture!
Area = renal column
Area = Pyramid
Type of tissue
Kidney – Nephron Structure
Renal corpuscle – Bowman’s
capsule & glomerulus
Renal tubule – Loop of Henle &
collecting duct
Nephron
Kidney Functions – Urine Formation
Filtration
 Almost everything pushed from
glomerulus to Bowman’s capsule
Reabsorption
 Anything you might need pulled from
renal tubule into bloodstream
Secretion
 Balancing act from blood into renal
tubule
Nephron
Micturition
Urine accumulates in bladder,
stretching the walls
Signal sent to brain to relax internal
urethral sphincter
You get “the urge…”
Voluntary relaxation of external
urethral sphincter
Kidney Stones
Hard mass of chemicals unable to
pass through ureter
Can be very painful
Treatment varies
Urinary Tract Infections (UTIs)
 Can be anywhere in tract but often in
trigone
 Often caused by intestinal bacteria
 Symptoms vary based on
location of infection
 Cranberry juice??
Kidney Transplant
Dialysis
 Starts when you lose 85% - 90% kidney function