1. The kidney

2. Kidney and bladder position

3. Excretion by the Kidney
Urea
-nitrogenous waste
-made by liver
-excess amino acids in blood
-toxic
Why must nitrogenous waste be excreted?

4. Kidney transplant

5. Cross section

6. X section to nephron

7. Filtration by the Kidney
Supplied with blood from renal artery
Inside it splits into many fine capillaries
Each capillary supplies blood to hundreds of thousands of tiny filtration units called nephrons
Renal artery
Renal vein
Ureter

8. Re-absorption by the Kidney
Once the main components of filtrate enter the kidney
-they are no longer in bloodstream
If nothing more happened in the nephron then all the useful stuff would be lost in the urine!
Therefore, glucose, water and some salts need to be reabsorbed!

9. More water reabsorbed
Variable amounts of water and salts reabsorbed and filtrate gradually turning into urine
Glucose reabsorbed
Final urine containing:
-excess water
-unneeded salts
-waste urea

10. Classwork: Ticket to Leave:
Write one paragraph in your notebook on why the liver and kidneys belong to the circulatory system. Extra credit if you can tell me how the small intestines connects to the circulatory system.
Ticket to Leave:
6 multiple choice mcas questions on the half sheet on the ELMO projector