1. Excretory System:
‘POISON’ Removal System

2. Excretory Function: Get rid of waste
Get rid of useless products excreted by cell
Get rid of harmful chemical build-up
4. Maintain HOMEOSTASIS

3. FOUR WASTES 1. Carbon dioxide (lungs) 2. Sweat (skin)
3. Urine (kidneys)
Solid waste/feces (large intestines)
Others:
(tears, ear wax, snot, gas)
(vomit and pus when sick or have an infection)

4. Role of Lungs:
Maintain level of CO2 and O2 in blood by EXCRETING carbon dioxide

5. Role of Skin: Sweat helps body temperature stay the same
2. Sweat is excreted through sweat glands
Sweat glands contain salt and water (the salt helps evaporate the water to keep the body cool)
Sweat glands located all over body

6. Role of LARGE INTESTINES:
Solid waste removal
2. Reabsorbed water from solid waste (feces) back into the body

7. Role of the LIVER: Stores glycogen, drug detoxification
Secretes bile: breaks down fat
3. Amino acids are broken down into ammonia (poisonous gas). Liver changes this to urea (mix of sugar and waste)

8. Role of KIDNEYS: Kidneys filter wastes from blood to form urine
Remove liquid waste
Your kidneys produce 1.5 liters of urine a day!

9. Urinary System Anatomy
Liver Kidney  Ureter  Bladder Urethra

10. Kidney Anatomy
Each kidney has a million tiny structures called nephrons.
Nephron= basic unit of the kidney
function of nephron:
filtering the blood
to regulate water and salt concentration in body
reabsorb what is needed
excreting the rest as urine.
HERE

11. What is urine?
yellow fluid stored in the bladder & released through the urethra
Made of water, salt, nitrogen compounds (urea) and other waste substances
removed from the blood by the kidneys

12. Maintaining Homeostasis: ADH
ADH= antidiuretic hormone
Causes water retention
Causes MORE water to be reabsorbed into the blood

13. Concentrated Urine: Dark Yellow Dilute Urine: Clear/light yellow