1. Removing unwanted waste
Excretory System
Removing unwanted waste

2. Excretory System System involved in removing metabolic waste
Waste removed as urine, sweat, carbon dioxide
Urine- water and waste produced from metabolic processes

3. Organs involved Lungs Skin Kidneys Liver
Remove carbon dioxide resulting from the breakdown of sugar during cellular respiration
Skin
Removes water and urea through sweat glands
Kidneys
Remove excess water and urea from blood stream, sending to the bladder
Liver
***Site of much protein breakdown in the body, resulting in excess nitrogen
Detoxifies harmful substances in the blood
Produces enzymes to break fat

4. Sources of waste Cellular respiration
Carbon from glucose as well as other materials must be removed from body. Done so by sending carbon dioxide to blood, then to lungs
Deamination (in liver)-when proteins are broken down, the amine groups (containing N) from amino acids are removed, and must exit the body
Amine group main component in urea

5. Route of waste in body Food digested
Absorbed through intestines into blood stream
Carbs broken down, sent to mitochondria for cellular respiration
 carbon dioxide
Proteins broken down as long-term energy
Nitrogen removal through kidneys to bladder
Nutrients not wanted pass through colon and out through rectum.

6. Main organ- kidney Kidney function- Absorption Active transport
Diffusion
osmosis

7. General system structure

8. Kidney structure

9. Renal cortex Outer portion of kidney
Holds most of the nephron, the functional portion of the kidney

10. Renal medulla
Inner portion of kidney, with many capillaries carrying blood to cortex
Contains lower part of nephron
Holds collecting tubes carrying excess material to center of kidney

11. nephron
Tangle of small capillaries and collecting ducts working to remove water and waste from blood
Large amounts (4x body’s content) of water removed every day, then most reabsorbed back into blood stream

12. Nephron structure Water and waste removed in glomerulus
Travels down tubules, where much of water and salt reabsorbed in loop of henle
Excess water and metabolic waste sent down collecting duct to be sent to ureter

13. glomerulus
Area where metabolic waste is originally pulled out of blood stream along with water
Fluid then continues down the renal tubule through the loop of Henle, then throughout the tube until reaches collecting duct

14. ureter
From nephrons, all collected waste is removed from kidney through ureter
Long tube descending from kidney, leading to urinary bladder

15. urethra
Once waste has been collected in bladder, it is removed from bladder through small opening called urethra