Excretion <ul><li>removal of metabolic waste </li></ul><ul><ul><li>does not include feces </li></ul></ul><ul><ul><li>feces...
Urine <ul><li>solution of metabolic waste </li></ul><ul><ul><li>urea and uric acid </li></ul></ul><ul><ul><li>salts </li><...
Urea <ul><li>product of two other waste molecules </li></ul><ul><ul><li>ammonia, NH 3 </li></ul></ul><ul><ul><li>carbon di...
Ammonia <ul><li>deamination  – removal of amine group </li></ul><ul><li>ammonia released when  liver  breaks down proteins...
Uric Acid <ul><li>product of nucleic acid breakdown </li></ul><ul><ul><li>specifically of purine bases (A and G) </li></ul...
Role of Kidneys <ul><li>urea and uric acid are filtered through the kidney </li></ul><ul><li>average person loses 2L of li...
Excretion: Ameoba <ul><li>Amoeba remove waste through a contractile vacuole. </li></ul>
capillary network bladder collection tubule nephridiopore nephrostome
Excretion: Fish <ul><li>Fish can excrete ammonia directly through their gills. </li></ul>
Excretion: Birds <ul><li>Birds excrete uric acid directly with feces. </li></ul>
Upcoming SlideShare
Loading in …5
×

03 excretion-2010 update

667 views

Published on

Published in: Business, Lifestyle
0 Comments
0 Likes
Statistics
Notes
  • Be the first to comment

  • Be the first to like this

No Downloads
Views
Total views
667
On SlideShare
0
From Embeds
0
Number of Embeds
1
Actions
Shares
0
Downloads
0
Comments
0
Likes
0
Embeds 0
No embeds

No notes for slide

03 excretion-2010 update

  1. 3. Excretion <ul><li>removal of metabolic waste </li></ul><ul><ul><li>does not include feces </li></ul></ul><ul><ul><li>feces is what your body did not use, therefore not metabolic waste </li></ul></ul>
  2. 4. Urine <ul><li>solution of metabolic waste </li></ul><ul><ul><li>urea and uric acid </li></ul></ul><ul><ul><li>salts </li></ul></ul><ul><ul><li>organic compounds </li></ul></ul><ul><ul><li>water </li></ul></ul><ul><li>fluid for urine comes from filtered blood and extracellular fluid (ECF) </li></ul>
  3. 5. Urea <ul><li>product of two other waste molecules </li></ul><ul><ul><li>ammonia, NH 3 </li></ul></ul><ul><ul><li>carbon dioxide, CO 2 </li></ul></ul><ul><li>Where does the ammonia come from? </li></ul><ul><li>amine group from amino acids </li></ul>
  4. 6. Ammonia <ul><li>deamination – removal of amine group </li></ul><ul><li>ammonia released when liver breaks down proteins </li></ul><ul><li>0.005 mg NH 3 is lethal </li></ul><ul><li>reacts with CO 2 to produce less toxic urea </li></ul><ul><li>100 000x less toxic than NH 3 </li></ul>
  5. 7. Uric Acid <ul><li>product of nucleic acid breakdown </li></ul><ul><ul><li>specifically of purine bases (A and G) </li></ul></ul><ul><li>uric acid released through liver metabolism </li></ul>
  6. 8. Role of Kidneys <ul><li>urea and uric acid are filtered through the kidney </li></ul><ul><li>average person loses 2L of liquids a day </li></ul><ul><li>suggested to consume 2L H 2 O / day </li></ul>
  7. 9. Excretion: Ameoba <ul><li>Amoeba remove waste through a contractile vacuole. </li></ul>
  8. 10. capillary network bladder collection tubule nephridiopore nephrostome
  9. 11. Excretion: Fish <ul><li>Fish can excrete ammonia directly through their gills. </li></ul>
  10. 12. Excretion: Birds <ul><li>Birds excrete uric acid directly with feces. </li></ul>

×