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 HOW DO WE REMEMBER ALL THE LIFE PROCESSES?  H.N.T.R.S.G.E.R.M.R  WHICH ONES HAVE WE COVERED?  NUTRITION & TRANSPORT & RESPIRATION  WHAT’S NEXT.

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Presentation on theme: " HOW DO WE REMEMBER ALL THE LIFE PROCESSES?  H.N.T.R.S.G.E.R.M.R  WHICH ONES HAVE WE COVERED?  NUTRITION & TRANSPORT & RESPIRATION  WHAT’S NEXT."— Presentation transcript:

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3  HOW DO WE REMEMBER ALL THE LIFE PROCESSES?  H.N.T.R.S.G.E.R.M.R  WHICH ONES HAVE WE COVERED?  NUTRITION & TRANSPORT & RESPIRATION  WHAT’S NEXT ON THE LIST?  WHY ARE WE SKIPPING TO “E”?  EXCRETION

4  WHAT IS EXCRETION?  DEFINTION  THE PROCESS BY WHICH METABOLIC WASTES ARE REMOVED  WHAT IS A METABOLIC WASTE? PRODUCTS OF THE LIFE PROCESSES (CHEMICAL REACTIONS) THAT ARE NOT NEEDED BY THE ORGANISM…IF THEY BUILD UP IN CONCETRATION THEY CAN BE TOXIC!!

5  WHAT ARE EXAMPLES OF METABOLIC WASTES? IN OTHER WORDS, WHAT ARE PRODUCTS OF REACTIONS IN THE BODY THAT WE DON’T USE??

6  THE MAJOR METABOLIC WASTES ARE  CARBON DIOXIDE  WATER  NITROGEN COMPOUNDS (EX. AMMONIA & UREA)  EXCRETION IS THE PROCESS BY WHICH THESE SUBSTANCES ARE REMOVED FROM THE BODY  HOW IS CARBON DIOXIDE REMOVED?  RESPIRATION / GAS EXCHANGE  SEE THE OVERLAP IN LIFE PROCESSES?

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8  BEFORE WE CONTINUE, EVERYONE MUST BE WARNED NOT TO CONFUSE EXCRETION WITH ELIMINATION !!!

9  EXCRETION IN PROTISTS  DO THEY NEED AN EXCRETORY SYSTEM?  HOW DO THEY GET RID OF CARBON DIOXIDE?  HOW DO THEY GET RID OF WATER?  HOW DO THEY GET RID OF NITROGENOUS WASTES?

10  EXCRETION IN HYDRAS?  DO THEY NEED AN EXCRETORY SYSTEM?

11  EXCRETION IN EARTHWORMS?  DO THEY NEED AN EXCRETORY SYSTEM? HOW DO THEY REMOVE CARBON DIOXIDE? HOW DO THEY REMOVE NITROGENOUS WASTE?

12  EXCRETION IN EARTHWORMS  SPECIAL STRUCTURE CALLED A NEPHRIDIA FILTERS OUT THE NITROGENOUS WASTE FROM THE BLOOD, THEN SHIPS IT OUT IN THE FORM OF URINE TO TINY “PORES” IN THE SKIN

13  EXCRETION IN GRASSHOPPERS?  DO THEY NEED AN EXCRETORY SYSTEM? HOW DO THEY REMOVE CARBON DIOXIDE? HOW DO THEY REMOVE NITROGENOUS WASTES?

14  EXCRETION IN GRASSHOPPERS  MALPIGHIAN TUBULES FILTER BLOOD AND PASS URIC ACID TO THE INTESTINE TO MIX WITH FECES

15  EXCRETION IN HUMANS  DO HUMANS NEED AN EXCRETORY SYSTEM? HOW DO THEY REMOVE CARBON DIOXIDE? HOW DO THEY REMOVE NITROGENOUS WASTES?

16  EXCRETION IN HUMANS  WHERE DO NITROGENOUS WASTES COME FROM? LIVER DETOXIFICATION  REMOVES HARMFUL SUBSTANCES FROM THE BLOOD BILE FORMATION  EXCESS BILE IS REMOVED IN FECES UREA FORMATION  RESULTS FROM BREAKDOWN OF AMINO ACIDS

17  EXCRETION IN HUMANS  WHERE DO NITROGENOUS WASTES COME FROM? BREAKDOWN OF AMINO ACIDS

18  EXCRETION IN HUMANS  WHEN AMINO ACID IS BROKEN DOWN, AMMONIA (NH 3 ) IS FORMED…BUT THAT IS TOO POISONOUS TO BE TRANSPORTED IN THE BLOOD, SO IT IS CONVERTED, BY THE LIVER, INTO A DIFFERENT NITROGENOUS COMPOUND CALLED UREA  UREA IS ABLE TO BE TRANSPORTED IN THE BLOOD, BUT MUST THEN BE FILTERED OUT TO BE EXCRETED!!

19  EXCRETION IN HUMANS  THE URINARY SYSTEM

20  EXCRETION IN HUMANS  THE URINARY SYSTEM IS RESPONSIBLE FOR FILTERING UREA OUT OF THE BLOOD FOR IT TO BE EXCRETED  MAJOR STRUCTURES KIDNEY**  FILTER URETER  CONNECTING TUBE BLADDER  URINE STORAGE URETHRA  EXIT TUBE

21  EXCRETION IN HUMANS  **HOW DO THE KIDNEYS WORK? THEY CONTAIN MANY, MANY N E P H R O N S

22  EXCRETION IN HUMANS  NEPHRONS

23  EXCRETION IN HUMANS  NEPHRON MAJOR STRUCTURES GLOMERULUS BALL OF CAPILLARIES BOWMAN’S CAPSULE FILTER LOOP OF HENLE REABSORPTION COLLECTING DUCT URINE COLLECTION

24  EXCRETION IN HUMANS  URINARY SYSTEM REMINDER

25  EXCRETION IN HUMANS  SOME UREA IS LOST IN SWEAT, ALSO

26  EXCRETION IN HUMANS  THE SKIN’S SWEAT GLANDS PRODUCES SWEAT WHICH HELPS REMOVE UREA *SWEAT IS 99% H 2 O  SWEAT ALSO HELPS REMOVE EXCESS HEAT!!

27  EXCRETION IN HUMANS  EXCRETORY DISORDERS CIRRHOSIS JAUNDICE GOUT KIDNEY STONES KIDNEY FAILURE

28  WHAT’S NEXT ON OUR LIFE PROCESS LIST?  RESPONSE  YOU NEED TO BE ABLE TO MOVE IN ORDER TO RESPOND…WHICH MEANS YOU NEED…

29  SUPPORT AND LOCOMOTION NEXT!!!


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