EXCRETION IN HUMAN BEING
the biological process that involved in the
removal of harmful metabolic waste from
the body is called “EXCRETION”
DIGESTIVE
RESPIRATION
TRANSPORTATION
AS IN OTHER PROCESS LIKE DIGESTIVE , RESPIRATION ,
TRANSPORTATION DIFFERENT ORGANISM USE DIFFERENT
STRATEGIES TO DO EXCREATION
UNICELLULAR
ORGANISM WASTE
ARE REMOVED FROM
BODY SURFACE INTO
THE SURROUNDING
WATER BY THE
PROCESS CALLED
DIFFUSION
MULTI – CELLULAR ORGANISM
•
SPECIALIZED ORGANS ARE EVOLVED TO PERFORM ‘ EXCRETION ‘
EXCRETION IN HUMAN BEING
The excretory system of human consist of :
1. A pair of kidney
3. Urinary bladder
2. A pair of ureter
4. urethra
KIDNEY
•
KIDNEY ARE LOCATED IN THE ABDOMEN ,
ON EITHER SIDE OF THE BACKBONE .
• KIDNEY IS A BASIC FILTRATION UNIT
• IT CONSIST OF :
- VERY THIN WALLED BLOOD CAPILLARIES
- EACH CAPILLARIES
CLUSTER IS CONNECTED
WITH CUP SHAPE END OF
A TUBE . ( THAT COLLECT
FILTRATED URINE )
• EACH KIDNEY HAS A LARGER NUMBER OF
FILTRATION UNIT CALLED “ NEPHRONS “ PACKED
CLOSE TOGETHER .
- THE WASTE PRODUCT THAT ARE COLLECTED FROM THE BLOOD IN THE FORM OF
URINE :
• THE PRODUCED URINE WILL PASS THROUGH URETERS INTO URINARY BLADDER .
• THE URINE IS STORED IN THE URINARY BLADDER AND THE URINE IS RELEASED TO
OUTSIDE THROUGH URETHRA .
HOW THE URINE IS PRODUCED ?
THE PROCESS OF URINE FORMATION TAKES
PLACE IN 3 STEP :
1. FILTRATION
2. RE ABSORPTION
3. SECRETION
THE URINE FORMED IN KIDNEY ENTER INTO A
LONG TUBE CALLED URETER
• THE ONE END OF THE URETER IS CONNECTED
TO KIDNEY AND THE OTHER ENDS IS
CONNECTED TO URINARY BLADDER
• URINE IS STORED IN THE URINARY BLADDER
UNTIL THE PRESSURE OF URINARY BLADDER
LEADS TO URGE TO PASS URINE .
• WHEN IT REACHES THE PRESSURE TO URGE
TO PASS IT , URINE PASSES THROUGH
URETHERA .
•