Excretion Science Form 3 Chapter 3

7/29/2019 Excretion Science Form 3 Chapter 3

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science

chap 3 :

excretion


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What is Excretion? (contd)

The most important waste products are_____________________________________

_______________ produced during cellular

respiration (in addition to ____________)

Nitrogen compounds (________________

_____________________) produced by the

breakdown of

______________(____________digestion)

___________

produced by _____________


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Lungs Kidney Skin

eliminate

throughthrough


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Excretory System

Excretion is a process of _____________________that are of ___________or in ___________from body.

Human excretory organs are SKIN, LUNGS andKIDNEYS.

If excretory products like urea, carbon dioxide, excess

mineral salts and excess water are allowed to_____________in the body, it will become_____________ (_____________) and endanger_________________.


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EXCRETORY ORGANS

Excretory Method SWEATING

1)The sweat glands

__________excretory product

from __________________around it.

2)Sweat is eliminated from the

________________through

_______________ to the surface

of the skin.

Excretory Products


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Excretory Method RESPIRATION

1)_______________in the

blood capillaries diffuses

into the

_______________and iseliminated from the

___________when

____________.

2)Water is eliminated from

the lungs in the form of

______________

Excretory Products

EXCRETORY ORGANS


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EXCRETORY ORGANS

Excretory Method URINATION.

1)Excretory products are carried

by the __________to the

___________and theneliminated as ______________.

**Kidney eliminated many

substances in____________

_______________________.

Excretory Products


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Removing Nitrogenous Waste Products

(3) Uric Acid

Not very toxic because_____________

Evolved as an adaptation of

land animals Many organisms try to

______________& excrete

their Nitrogen waste as a

____________! (little loss ofwater is involved)

Examples: ____________

_________________________


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The Mystery behind Bird Poop

Unlike mammals, birds ___________________.

Their kidneys extract nitrogenous wastes from thebloodstream, and excrete it in the form of ___________.

Uric acid has a very __________________in water, so itemerges as a _________________.


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URINARY SYSTEM

1) The ____________is part of

excretory system.

2)The uninary system cosists of :

a)a pair of ______________

b)a _______________c)a pair of ______________

_____________

3) The blood carried by the

_______________to the kidney is_______________and excretory produ

are the eliminated from the

____________as _________.


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HUMAN KIDNEYS1) The kidneys are situated to the left

and right ____________of the

______________________

2)Human kidneys are ___________in

colour and is _______________

3)The outer part which is dark red in

colour named ___________

4)The inner part which is light red incolour named ______________

5)The ______________is the part where

The ureter begin.


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HUMAN KIDNEYS

ORGANS FUNCTION

Ureter

Urinary

Bladder

Urethra

Renal

Artery

Renal

Vein


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HUMAN KIDNEYS

Functions of kidneys :

a)eliminating ______________and the _______________________ in the body

b)__________________the amount of_____________and _________________in thebody.

c)regulating the blood ________________.d)helping to removes __________________

substances like __________and________________ from the body


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The importance of maintaining a healthy kidney

Under normal conditions, substances like ___________________ and ________________are not found in theurine.

If ________________is found in the urine, it is most likelythe person has ___________________.

If kidneys do not function ________________, toxicsubstances in the blood will ______________and this willlead to ____________________.

The kidney will function properly if we :

a)drink a lot of ______________________.b)avoid drinking ________________.

c)reduce drinking __________________drinks.

d)reduce eating food with _________________________


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What kinds of animals have the most

efficient kidneys?

__________animals mustbe able to conserve

moisture

Most terrestrial animalsmust drink

______________often;

however the___________

______ does not need to

drink water very often its

kidneys absorb every little

___________of water


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Kidney Failure

If renal failure occurs,

people must get their blood filtered through

_______________.


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GoutIs a disease where the human body accumulates

____________ in the joints. _________________,

______________ and ______________failure lead to thisproblem.


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PLANT EXCRETION

eliminate

throughthrough through


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excretion in plants

Plants do not have a _____________excretory system.

Respiration in plants eliminates _______________ and______________________

Photosynthesis eliminates excess _____________from

plants. Complex excretory products gather on ___________

___________________________________________ etc.to be _______________or ________________.

Some excretory products of plants are__________________while some are________________to humans.

Some beneficial excretory products of the plants can

endanger human health if__________________.


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Products Of Plants And Their

UsesEXCRETORYPRODUCT SOURCE USE

Latex

Resin

Gum

Acid (tannic

acids or tannin)

Quinine

Oil


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science

chap 3 :

excretion


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What is Excretion? (contd) The most important waste products are CO2,

nitrogen compounds, and salts.

CO2 produced during cellular respiration

(in addition to water)

Nitrogen compounds (ammonia, urea, and

uric acid) produced by the breakdown ofamino acids (protein digestion)

Salts produced by metabolism


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Human excretion

Carbon dioxideand water

Lungs

Water, Urea andmineral salts

Kidney Skin

* Cortex

*Medulla

*Pelvis

Urinary

bladder

*Sweat gland

*Sweat pores

eliminate

throughthrough


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Excretory System

Excretion is a process of removing substances thatare of no use or in excess from body.

Human excretory organs are SKIN, LUNGS andKIDNEYS.

If excretory products like urea, carbon dioxide,

excess mineral salts and excess water are allowedto accumulate in the body, it will becomepoisonous (toxic) and endanger health.


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EXCRETORY ORGANS

Excretory 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 + UreaSweat


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Excretory Method RESPIRATION1)Carbon dioxide in the blood

capillaries diffuses into the

alveolus and is eliminated

from the lungs whenexhaling.

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 ORGANS

Excretory 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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Why do we need to excrete Ammonia?

All organisms produce ammonia as they

metabolize nutrients (protein digestion)

Ammonia is a nitrogenous waste that is toxic

and must be removed from the body

How an organism removes ammonia depends

upon where it lives

Removing Nitrogenous


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Removing Nitrogenous

Waste Products

(1) Ammonia (NH3):

-Requires little energy

-Ammonia is highly toxic!

-This form of waste can only be used if

the organism lives in an aquatic

environment

-Example: Paramecium,, some ocean

fish

.


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(2) Urea:

- Many land animals and somebony fish (amphibians,

mammals) dilute the toxicammonia with water.

- This substance is called Urea & is

filtered out by the kidneys.- The problem is they do lose

water in the process!

- Requires Energy


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(3) Uric Acid

Not very toxic because

insoluble

Evolved as an adaptation ofland animals

Many organisms try to

conserve water & excrete their

Nitrogen waste as a solid!

(little loss of water is involved)

Examples: insects, reptiles,

birds


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The Mystery behind Bird Poop

Unlike mammals, birds do not urinate.

Their kidneys extract nitrogenous wastes from thebloodstream, and excrete it in the form of uric acid.

Uric acid has a very low solubility in water, so itemerges as a white paste.


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URINARY SYSTEM

1) The urinarry system is part of

excretory 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 KIDNEYS

1) 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

body

Renal

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 andmineral salts in the body.

c)regulating the blood concentration.

d)helping to removes nitrogenous

substances like urea and uric acid from the

body


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The importance of maintaining a healthy kidney

Under normal conditions, substances likeprotein(amino acids) and glucose are not found inthe urine.If glucose is found in the urine, it is mostlikely the person has diabetes.

If kidneys do not function properly, toxic substancesin the blood will accumulate and this will lead todeath.

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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efficient kidneys?

Desert animals must beable to conserve moisture

Most terrestrial animals

must drink fresh wateroften; however the

kangaroo rat does not

need to drink water veryoften its kidneys absorb

every little drop of water


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Kidney Failure

If renal failure occurs,

people must get their blood filtered through

Dialysis.

Gout


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GoutIs a disease where the human body accumulates Uric acid in

the joints. Heredity, alcohol & kidney failure lead to this

problem.


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PLANT EXCRETION

Carbon dioxide,oxygen and water

Leaf

Stomata

Water, urea and

mineral salts

Tree

Stem

Bark

Quinine andtannin

eliminate

throughthrough through


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excretion in plants

Plants do not have a specific excretory system. Respiration in plants eliminates carbon dioxide

and water.

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 beneficialwhile some are dangerous to humans.

Some beneficial excretory products of the plantscan endanger human health ifmisused.


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Products Of Plants And Their

UsesEXCRETORYPRODUCT 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 (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

Oil

Flowers or leaves of certain

trees

To make perfume and ointment

for insect bites


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Excretion Science Form 3 Chapter 3

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Transcript of Excretion Science Form 3 Chapter 3