1. Intro to Excretion

2. Excretion  Excretion –Release and removal of metabolic wastes  Metabolic Wastes  Excess water  Salts  Carbon Dioxide  Nitrogenous Wastes

3. Excretion  Result from the breakdown of proteins  Toxic  Ammonia  Uric Acid  Urea

4. Excretory System  Excretory system- –Skin (sweat)  Excess water  Salts  Small amounts of urea –Lungs  Carbon Dioxide –Kidneys (urine)  Water  Salts  Urea  Uric Acid

5. Diagram A – Kidneys and Urinary Tract  1. Kidney –Filters blood  2. Ureter –Carries urine from kidney to bladder  3. Bladder –Stores urine  4. Urethra –Eliminates urine from the body

6. Diagram A – Kidneys and Urinary Tract  Also –aorta (left)- red –inferior vena cava (right)- blue

7. Diagram B- Kidney  1. Medulla –“Middle” area of kidney, between cortex and pelvis  2. Nephron –Functional unit of kidney, filtration occurs here  3. Cortex –Outer portion of kidney

8. Diagram B- Kidney  4. Ureter –Carries urine from kidney to bladder  5. Renal vein –Carries filtered blood from kidney  6. Renal artery –Carries unfiltered blood to kidney

9. Diagram B- Kidney  7. Pelvis –Collects urine from the collecting tubules

10. Diagram C- Nephron  1. Convoluted Tubules –Carry the materials filtered from the blood  2. Loop of Henle –Tubule that drops then goes up through the capillary net

11. Diagram C- Nephron  3. Collecting tubules –Collects urine from the convoluted tubules  4. Venule –Returns filtered blood to renal vein  5. Arteriole –Brings unfiltered blood from renal artery

12. Diagram C- Nephron  6. Bowman’s Capsule –Cuplike structure that collects filtrate from blood (filtration)  7. Glomerulus –Ball of capillaries inside Bowman’s Capsule (filtration)

13. Diagram D- Filtration  A. Blood entering Nephron –needed materials –wastes  C. Enters Bowman’s Capsule- (filtrate) –water –amino acids –glucose –salts –Urea

14. Diagram D- Filtration  B. Remains in blood- –blood cells –plasma proteins

15. Diagram D- Reabsorption  D. Reabsorbed into blood- –needed water –amino acids –glucose –salts

16. Diagram D- Excretion  E. Excreted as urine- –water –urea –salts –uric acid