1. OBJ: Given video, notes, activity sheet SWBAT explain the structures/functions of the Excretory System and how kidneys filter liquid waste with 70% accuracy. BRING IN TEXTBOOK DN: Hand-in Pulse Rate/Heart Beat/Physical Activity (college style) Lab write-up ; ACT: Introduction to Excretory System (Notes) Video: The Excretory System(5363) Text, read p. 127-131 HW: Complete Excretory System Booklet and Complete CLRE Review Sheets; CRE EXAM, this Tuesday March 10.

2. Excretory System Notes Excretory System: collects and removes waste [ solids - rectum of Digestive System; liquids - kidneys of Urinary System; gases - lungs of Respiratory System ].

3. Excretory System Notes Excretory Organs: kidneys, lungs, skin, ureter, urinary bladder, urethra Kidneys: organ which removes liquid waste from the blood; a “filter”; humans have 2 kidneys Urea: breakdown of protein Liquid waste: urine (urea, water, other) Ureter: tube which connects from kidneys to urinary bladder. Urinary Bladder: saclike muscular organ which stores urine. Urethra: tube which connects urinary bladder to outside of body.

4. Excretory System Notes

5. Kidney: contain many nephrons; Each nephron filters the blood. By the process of osmosis (diffusion), urea and some water is removed but sugar and much of the water is returned to the blood (reabsorption). The urine is then stored in the urinary bladder for future removal from the body.

6. Uric Acid Crystals Urate = salts of Uric acid GOUT

8. Excretory System Notes

9. Gout : too high Uric acid levels in blood serum Kidney Stones bone erosion

10. Urinary Bladder Stones

11. Hemorrhoids