1. The Excretory System 14
Lesson 14.1: Anatomy of the Kidney Lesson 14.2: Urine Formation, Storage, and Excretion Lesson 14.3: Diseases and Disorders of Excretory System

2. Kidney Location and Size

3. Anatomy of the Kidney renal cortex renal medulla renal pelvis outer
middle
renal pelvis
Inner (drainage area)

4. Anatomy of the Kidney
renal medulla
pyramid
columns
ureter
bladder

5. Nerve and Blood Supply 20–25% of blood flows to kidneys renal artery
renal vein
sympathetic nerve system
renal nerve fibers

6. The Nephron basic working unit of each kidney two main parts
renal corpuscle
glomerulus
renal tubule

7. Blood Flow through the Kidneys
renal artery
afferent arteriole
glomerulus
efferent arteriole
peritubular capillaries or vasa recta
renal vein

8. Urine Formation, Storage, and Excretion
Chapter 14: The Urinary System
Lesson 14.2
Urine Formation, Storage, and Excretion

9. Urine Formation filtration reabsorption secretion
water and solutes from capillary to glomerular capsular space
reabsorption
water and solutes move from tubule to capillary
secretion
wastes in capillary pushed into tubule

10. Urine Formation

11. Reabsorption

12. The Renal Medulla nephron loop (loop of Henle) descending loop
reabsorb water
ascending loop
reabsorb sodium

13. Hormonal Regulation of Urine Volume and Composition
aldosterone
renin reacts & produces angiotensin
atrial natriuretic peptide
causes urine volume to increase
antidiuretic hormone
causes urine volume to decrease

14. Urine Storage ureter bladder urethra kidney to bladder stores urine
bladder to outside body

15. Urine Storage

16. Urine Excretion
micturition
urination

17. Assessing Renal Function
Urine- pH range 4.5–8.0
95% water, 5% waste
glomerular filtration rate
estimate with creatinine in blood

18. Chronic Kidney Disease
kidney damage
filtration rate under 60 ml/min for at least 3 months
develops slowly

19. Renal Dialysis hemodialysis peritoneal dialysis dialyzer
dialysis solution
peritoneum acts as dialysis membrane
Done at home

20. Diabetes diabetes mellitus diabetes insipidus glucose in urine
type I, type II
diabetes insipidus
large amount of dilute urine
ADH not made or not used

21. Diseases and Disorders of the Urinary System
kidney stones
calcium, magnesium, or uric acid
urinary tract infection
Cystitis-bladder inflammation
more common in women than men