nota excretion
TRANSCRIPT
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science
chap 3 :
excretion
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Human excretion
* Cortex
*Medulla
*Pelvis
Urinary
bladder
*Sweat gland
*Sweat pores
eliminate
throughthrough
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Excretory System Excreation is a process of removing substances that are of
no use or in excess from body.
Human excretory organs are SKIN, LUNGS andKIDNEYS.
If excretory products like urea, carbon dioxide, excessmineral salts and excess water are allowed to accumulatein the body, it will become poisonuis (toxic) and endangerhealth.
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EXCRETORY ORGANSExcretory Method SWEATING
1)The sweat glands absorbs
excretory product from blood
capillaries around it.
2)Sweat is eliminated from the
sweat gland through sweat
pores to the surface of the skin.
Excretory Products Water + Mineral Salts + Urea
Sweat
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Excretory Method RESPIRATION
1)Carbon dioxide in the
blood capillaries diffuses
into the alveolus and is
eliminated from the lungs
when exhaling.
2)Water is eliminated from
the lungs in the form of
water vapour.
Excretory Products Water and Carbon dioxide
EXCRETORY ORGANS
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EXCRETORY ORGANSExcretory Method URINATION.
1)Excretory products are carried
by the blood to the kidney and
then eliminated as urine.
**Kidney eliminated many
substances in large quantities.
Excretory Products Water, Urea and excess Mineral
Salts.
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URINARY SYSTEM1) The urinarry system is part ofexcretory system.
2)The uninary system cosists of :
a)a pair of kidneys
b)a urinary bladderc)a pair of ureters
d)urethra
3) The blood carried by the
renal artery to the kidney isfiltered and excretory products
are the eliminated from the
blood as urine.
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HUMAN KIDNEYS1) The kidneys are situated to the left
and right back section of the
abdominal cavity.
2)Human kidneys are dark red incolour and is bean-shaped.
3)The outer part which is dark red in
colour named cortex
4)The inner part which is light red in
colour named medulla
5)The pelvis is the part where the
ureter begin.
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HUMAN KIDNEYS
ORGANS FUNCTION
Ureter
Channels urine from the kidneys to the urinary
bladder
Urinary
Bladder Stores urine
Urethra
Channels urine from the urinary bladder out of the
bodyRenal
Artery Transports oxygenated blood to the kidneys
Renal
Vein
Transports deoxygenated blood away from the
kidneys
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HUMAN KIDNEYS Functions of kidneys :
a)eliminating excess water and the mineral
salts in the body
b)regulating the amount of water and
mineral salts in the body.
c)regulating the blood concentration.
d)helping to removes nitrogenoussubstances like urea and uric acid from the
body
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The importance of maintaining a healthy
kidney Under normal conditions, substances like
protein(amino acids) and glucose are not foundin the urine.If glucose is found in the urine, it is
most likely the person has diabetes. If kidneys do not function properly, toxic
substances in the blood will accumulate and thiswill lead to death.
The kidney will function properly if we :a)drink a lot of clean water.
b)avoid drinking alcohol.
c)reduce drinking gassy drinks.
d)reduce eating food with high sugar content
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PLANT
EXCREATION
Leaf
Stomat
a
Tree
Stem
Bar
k
eliminate
throughthrough through
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excretion in plants Plants do not have a specific excretory system.
Respiration in plants eliminates carbon dioxide andwater.
Photosynthesis eliminates excess water nfrom plants.
Complex excretory products gather on LEAVES,FLOWERS, BARK, STEMS, FRUIT etc. to bedropped or eliminated.
Some excretory products of plants are beneficial whilesome are dangerouse to humans.
Some beneficial excretory products of the plants canendanger human heatlh ifmisused.
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Products Of Plants And Their
UsesEXCRETORYPRODUCT SOURCE USE
Latex Rubber tree To make vehicle tyres
ResinCertain tree stems like thecasuarina tree To make varnish and gum
Gum
Certain tree stems like the
acacia tree To make cough madicine
Acid (tannic
acids or tannin)
Bark of plants like the tea,
coffee and mangrove tree To make ink
Quinine Bark of cinchona tree To make to treat malaria
OilFlowers or leaves ofcertain trees
To make perfume and ointment for insectbites
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Excretory Products Of Plants That
Dangerous To HumansEXCRETORY
PRODUCT SOURCE USE
Latex Rubber tree To make vehicle tyres
Resin
Certain tree stems like
the casuarina tree To make varnish and gum
Gum
Certain tree stems like
the acacia tree To make cough madicine
Acid (tannicacids or tannin)
Bark of plants like the
tea, coffee andmangrove tree To make ink
Quinine Bark of cinchona tree To make to treat malaria
Oil
Flowers or leaves of
certain trees
To make perfume and ointment fot
insect bites