1- THE WORLD THROUGH OUR SENSES

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Form 2: Science chapter 2

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THE WORLD THROUGH OUR SENSES:

THE WORLD THROUGH OUR SENSES

PowerPoint Presentation:

Nastic movement Tropisms Stereophonic hearing Sound absorption Sound reflection 1.8 1.7 Stimuli 1.6 Eye Inner Middle Outer Ear Taste receptors Tongue Chemical in the air Sensory cells Nasal cavity Nostrils Detects Structure Touch Pressure Pain Heat Cold Stimuli Epiermis Skin Effectors Brain Nerve impulse Nerve 1.5 Structure Stimuli Stimuli 1.4 Taste buds 1.3 Nose Light 1.2 1.1 Photoreceptor Light reflection Light refraction Vision detect Dermis Layers Senses Sensory organs Receptors Stimuli THE WORLD TROUGH OUR SENSES CHAPTER 1 1.9

Sensory organs:

Sensory organs Our senses detect stimuli and we respond. TOUCH SMELL TASTE HEARING SIGHT

SKIN :

SKIN The skin is made up of three layers- the epidermis , the dermis and the fatty layer. There are many different types of sensors in the skin. The number of sensors varies in different parts of our body. The sensitivity of the skin depends on two factors: The thickness of the epidermis The number of receptors

NOSE:

NOSE Smells are chemical in the air. The chemical dissolve in the moist lining of your nose . The nasal cavities have glands which produce a sticky fluid called mucus. A person having a cold cannot smell well. This is because the sensory cells are covered with a lot mucus and not much chemicals can reach and stimulate the sensory cells .

Tongue:

Tongue Your senses of taste and smell are closely linked. They are both chemical senses. You can only taste sweet, sour, bitter, and salty things. People think that they can taste other things but they are actually using their sense of smell . The sensors that give you your sense of taste are found in little grooves on your tongue. They are call taste buds .

Ears:

Ears The air around us is full of sound waves. HOW THE HUMAN EARS WORK

Eye:

Eye Light travels in a straight line. Light can travel through vacuum Light can be reflected and absorbed A periscope and a kaleidoscope uses the reflection of light Light can be refracted. Light is refracted when light travels from a medium to another medium.

How we detect colour?? Bagaimana mata mengesan warna?:

How we detect colour ?? Bagaimana mata mengesan warna ?

Camera and Eyes:

Camera and Eyes

Mechanism of sight mekanisma penglihatan:

Mechanism of sight mekanisma penglihatan Imej terbentuk di atas retina

PowerPoint Presentation:

THE PROCESS OF SEEING

Reflection of lights pantulan cahaya:

Reflection of lights pantulan cahaya Smooth area Permukaan licin Rough area Permukaan kasar

Defects of Vision:

Defects of Vision Long-sightedness ( Hyperopia) Short-sightedness (Myopia) Blindness Astigmatism Color blindness Optical illusion Blind spot

LONG-SIGHTEDNESS rabun jauh:

LONG-SIGHTEDNESS rabun jauh - Near objects look blurry Objek dekat kelihatan kabur - Eyeball too short Bola mata terlalu pendek - Lens too thin Kanta terlalu nipis CORRECTION Wearing convex lens Pemakaian kanta cembung

SHORT-SIGHTEDNESS rabun dekat:

SHORT-SIGHTEDNESS rabun dekat - Distant objects look blurry Objek jauh kelihatan kabur - Eyeball too long Bola mata terlalu panjang - Lens too thick Kanta terlalu tebal CORRECTION Wearing concave lens Pemakaian kanta cekung

BLINDNESS buta:

BLINDNESS buta Why some people got blind? Incomplete development of the eye since birth Perkembangan mata yang tidak lengkap sejak lahir Injury to the eye or the brain Kerosakan pada mata atau otak Eye deseases such as cataract Penyakit mata seperti katarak

ASTIGMATISM astigmatisme :

ASTIGMATISM astigmatisme Imej terbentuk tidak berfokus Cylindrical lens or surgery Menggunakan kanta berbentuk silinder atau pembedahan

COLOUR BLINDNESS buta warna:

COLOUR BLINDNESS buta warna Can’t differentiate red and green colour Tidak dapat membezakan warna merah dan hijau

OPTICAL ILLUSIONS Ilusi optik:

OPTICAL ILLUSIONS Ilusi optik Is it a straight line or not?? Garisan lurus atau tidak ? Yes, it’s straight line but our brain interpret it’s not because brain has been misled by other object

BLIND SPOT bintik buta:

BLIND SPOT bintik buta

STREOSCOPIC VISION penglihatan streoskopik:

STREOSCOPIC VISION penglihatan streoskopik

MONOCLUAR VISION Penglihatan monokular:

MONOCLUAR VISION Penglihatan monokular

DEVICES TO OVERCOME LIMITATION OF SIGHT alatan untuk mengatasi had penglihatan:

DEVICES TO OVERCOME LIMITATION OF SIGHT alatan untuk mengatasi had penglihatan

SOUND Bunyi:

Produced by vibrating objects Dihasilkan oleh objek yang bergetar Vibration objects transfer the kinetic energy to the layer of air. Objek yang bergetar memindahkan tenaga kinetik ke lapisan udara SOUND Bunyi The production of sound Penghasilan bunyi

TRANSFER OF SOUND pemindahan bunyi:

TRANSFER OF SOUND pemindahan bunyi Sound needs medium to travel such as solids, liquids and gases. Bunyi memerlukan medium untuk berpindah seperti pepejal , cecair dan gas Sound cannot travel through a vacuum. Bunyi tidak boleh dipindahkan melalui vakum Sound travel fastest in solids and slowest in gases because of the arrangement of particles Paling cepat dipindahkan melalui pepejal

REFLECTION AND ABSORPTION OF SOUND pantulan dan penyerapan bunyi:

Reflection sound is known as echo Pantulan bunyi dikenali sebagai gema Echo is depend on the type of the surface of an object Gema adalah bergantung kepada jenis permukaan objek Smooth, even and hard surfaces are good sound reflector Permukaan licin , rata dan keras adalah pemantul bunyi yang baik Rough, hollow and soft surfaces are good sound absorber Permukaan kasar , berongga dan lembut adalah penyerap bunyi yang baik REFLECTION AND ABSORPTION OF SOUND pantulan dan penyerapan bunyi

DEFECTS OF HEARING kecacatan pendengaran:

DEFECTS OF HEARING kecacatan pendengaran Temporary Permanent Deafness

LIMITATION OF HEARING had pendengaran:

LIMITATION OF HEARING had pendengaran

DEVICES TO OVERCOME HEARING LIMITATION Alatan mengatasi had pendengaran:

DEVICES TO OVERCOME HEARING LIMITATION Alatan mengatasi had pendengaran

Nastic movement pergerakan nasti:

Nastic movement pergerakan nasti Thermonasty Changes of temperature Mengikut perubahan suhu Photonasty Changes of dark and light Mengikut perubahan cahaya Haptonasty Happened when touched Berlaku apabila disentuh