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AP Biology 2008-2009 Excretory System 38-3 AP Biology 2008-2009 Functions of the Excretory System.

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Presentation on theme: "AP Biology 2008-2009 Excretory System 38-3 AP Biology 2008-2009 Functions of the Excretory System."— Presentation transcript:

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2 AP Biology Excretory System 38-3

3 AP Biology Functions of the Excretory System

4 Regents Biology What liquid waste do we make?  Digesting protein makes poison  nitrogen waste = ammonia = poison H CO 2 + H 2 O NH 2 = ammonia H H N C—OH || O H | —C— |

5 Regents Biology Nitrogen waste disposal in water  Ammonia

6 Regents Biology Nitrogen waste disposal on land  Land animals  need to save H 2 O  evolved less poisonous waste product  urea  excrete urea & H 2 O as urine

7 Regents Biology Nitrogen waste disposal in egg  Egg-laying land animals  no place to get rid of waste while in egg  needs waste that doesn’t dissolve in water inside egg  uric acid  stays a powder, doesn’t dissolve in water  birds, reptiles, insects

8 Regents Biology Uric acid  adults excrete white paste not liquid waste  white bird poop is really their pee! Getting a little personal, aren’t we!

9 Regents Biology  transport proteins  Waste urea leaves cell by diffusion How do animal cells regulate their contents? O2O2 sugar nutrients CO 2 urea nutrients O2O2

10 Regents Biology Organs of the Urinary System  The main organs of the urinary system are two bean-shaped kidneys.  The kidneys filter blood that contains wastes collected from cells.  It is made up of about 1 million tiny filtering units called nephrons (NEF rahnz)

11 Regents Biology Human kidney  Mammals have a pair of bean-shaped kidneys  Blood is supplied by a renal artery  leaves by a renal vein

12 Regents Biology  In approximately 5 min, all of the blood in your body passes through the kidneys  Approx. 2,000 L of blood is filtered daily by the kidneys. Filtration in the Kidney

13 Regents Biology Bladder

14 Regents Biology Nephron = Kidney’s filter  Blood enters the nephrons.  Cells and proteins stay in the blood  Water, sugar, salt and wastes in the blood enter the tubules in a cuplike structure in the nephron.  Its called “filtrate”  Capillaries reabsorb most of the water, sugar, and salt.  Becomes urine  to bladder

15 Regents Biology Urine  Urine exits the kidneys into ureters.  Urine flows from ureters to the bladder.  Urine flows from the bladder through the urethra and out of the body

16 Regents Biology Dialysis  A person who has only one kidney still can live normally.  The remaining kidney increases in size and works harder to make up for the loss of the other kidney.  If both kidneys fail, the person will need to have his or her flood filtered by an artificial kidney machine in a process called dialysis (di AH luh sus)


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