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EXCRETORY SYSTEM.

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Presentation on theme: "EXCRETORY SYSTEM."— Presentation transcript:

1 EXCRETORY SYSTEM

2 THE EXCRETORY SYSTEM The excretory system helps to remove body wastes safely. The kidneys act like filters. The kidneys rid the body of wastes products in the blood. The process of removing waste is called excretion.

3 KIDNEYS The two kidneys are located near the spine in the middle of the back. They are protected by lower ribs and covered by layers of fat.

4 KIDNEYS Without the kidneys, it would not take long before the body’s system would be poisoned by its own waste. It is possible to function with only one kidney.

5 Each kidney is made up of millions of tiny tubules called nephrons.
Blood pressure is very high in the nephron, so waste is pushed across a thin membrane into a tubule. The waste is dissolved in a small amount of water. The water is carried by the ureter to the bladder The urine is stored in the bladder Functioning of a kidney

6 URINE Waste drains out of the bladder in the form of urine.
Urine is about 95% water and 5% waste (from protein breakdown). Fresh urine has no bacteria in it. It is quite clean (probably cleaner than your hands).

7 Anatomy of a Kidney

8 NEPHRONS

9 FILTRATION & REASBSORPTION


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