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CHAPTER 3

EXCRETION

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Overview

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A student is able to:

explain what excretion is

identify the excretory organs in humans

state the excretory products of each excretory organ

explain the importance of excretion

identify the locations of kidneys and other parts of the

urinary system describe the shape of the kidney

identify the structures of the kidney

describe the functions of the kidney

explain the importance of maintaining healthy kidneys

describe the ways plants eliminate their excretoryproducts

identify the excretory products of plants

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What is excretion?

Excretion is the process ofeliminating

waste materials from the body

Carbon dioxide

Water

Mineral salt

Urea

Nitrogenous waste

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Excretory organs Excretory method Excretory products

Lungs

Kidney

Skin

Task 1: Copy the table in note book.

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Lungs

Trachea

Alveolus

Bronchus

Bronchiole

Excretory method:

-Exhalation

Excretory products:

- Carbon dioxide

- Water vapour

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Kidney

Excretory method:

-Urination

Excretory products:

- Mineral salts

- Water

- Urea

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Skin

Sweat pore

Sweatgland

Excretory method:

-Sweating

Excretory products:

-Mineral salts

-Water

-Urea

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The importance of excretion

1. To maintain health excretory products likeurea can poison living cells if left toaccumulate in the body.

2. To regulate blood concentration highconcentration of salts in the body canincrease blood concentration.

3. To regulate body temperature evaporationof sweat at the skin surface can cool thebody.

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Human Urinary System

Renal vein

Right kidneyLeft kidney

Renal artery

Ureter

Urinary bladder

Urethra

Soalan cepucemas:

Mengapa kedudukan

ginjal kanan sedikit ke

bawah berbandingginjal kira?

untuk memberi ruang

kepada hati.

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Task 2: Draw and label human urinary

system (h/work)

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Locations of kidneys

located at the back of the abdomen, just

below the diaphragm

Shape of the kidneys

looks like broad bean-shaped organ andred dark in colour

Functions of the kidneys

to filter blood and remove waste products

in the form of urine.to maintain the balance of water contentin the body.

to regulate the blood concentration.

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Kidney Failure

Caused by:

infections.

unhealthy diet (high intake of sugar and salt).

Treatment:

kidney transplant.

heamodialysis.

Prevention:

practice healthy lifestyle (drink at least 8

glasses of water everyday).

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Excretion in plant

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Useful excretory products

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Useful excretory products

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Task 3: Complete your notes about the

chapter.

Your notes should have:

Meaning of excretion

Table of excretory organs, the excretory products

and excretory method.

The importance of excretion

The locations, the shape, the structures and the

functions of the kidney The ways plants eliminate their excretory products

The excretory products of plants

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The end ...H/work

do exercise in topical module

Chapter 3

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