1. The Urinary System
Chapter 15

2. Big picture functions of urinary system
produces & expels urine (which ultimately. . . )
produces hormones
excretion of metabolic wastes

3. Gross anatomy of urinary system
kidneys
ureters
urinary bladder
urethra

5. Internal anatomy of kidneys
renal cortex:
renal medulla:
nephrons:
renal pelvis:
rich blood supply

9. The nephron

11. The kidneys are the chief osmoregulators in humans
Kidneys maintain water balance & solute concentration in body fluids by
filtration of blood: water, ions & other dissolved substances are removed from blood leaving just cells & large proteins
in glomerulus & glomerular capsule
reabsorption of water, nutrients (glucose & AA) & ions back into blood, concentrating filtrate
secretion of substances not needed by body; final adjustments to concentration & composition of urine
excretion of urine

12. Hormonal regulation of kidney function
angiotensin II
aldosterone
atrial natriuretic peptide (ANP)
antidiuretic hormone (ADH)

13. What kidneys do to maintain pH
Remember this reaction?: CO2 + H2O  H2CO3  H+ + HCO3-

14. Malfunction: chronic kidney disease