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The Senses Chapter 35. 5 senses --- touch, taste, smell, sight & hearing  TOUCH The skin is the organ of touch Touch is a combination of pain, pressure,

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Presentation on theme: "The Senses Chapter 35. 5 senses --- touch, taste, smell, sight & hearing  TOUCH The skin is the organ of touch Touch is a combination of pain, pressure,"— Presentation transcript:

1 The Senses Chapter 35

2 5 senses --- touch, taste, smell, sight & hearing  TOUCH The skin is the organ of touch Touch is a combination of pain, pressure, hot & cold  TASTE The tongue is the organ of taste Receptors for taste are located in the taste buds Sweet--- tip of tongue Salt--- sides of tongue near front Sour--- sides of tongue near back Bitter--- across back of tongue

3 SMELL The nose is the organ of smell The Olfactory neurons in the nose detect smell SIGHT The eye is the organ for sight

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5 The Eye PARTFUNCTION conjunctivaprotection scleraLets no light through Holds the eye in shape corneaLets light into the eye choroidNourishes eye & prevents reflection of light with in eye

6 Fovea (yellow spot)Contains cones only– region of sharpest vision Blind spotWhere optic nerve leaves the eye Optic nerveCarries impulses from the eye to the brain LensChanges shape to focus light on the retina Ciliary muscleCause the lens to change shape

7 Iris (coloured part)Controls the amount of light entering the eye PupilLets light into the eye Aqueous HumourHolds the front of the eye in shape RetinaContains rods & cones (the light receptors) Rods for black & white vision & work in dim light Cones for colour vision & work in bright light Vitreous HumourHolds the back of the eye in shape

8 Long Sightedness--Hypermetropia  Person with long sight can see distant objects clearly, but cannot see near objects  Cause: eyeball is too short  To Fix: use CONVEX lens

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10 Short sightedness--- Myopia  Person can see near objects clearly, but cannot see distant objects  Cause: the eyeball is too long  To Fix: use CONCAVE lens

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12 Accommodation  Is the ability of the eye to focus light from objects at different distances by altering the focal length of the retina

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14 Response of Iris to light  BRIGHT LIGHT the circular muscles contract the size of the pupil decreases Less light enters the eye

15  DIM LIGHT The circular muscles relax The size of the pupil increases More light enters the eye

16 Hearing  The function of the ear is hearing and balance  There are 3 sections to the ear 1. Outer ear 2. Middle ear 3. Inner ear

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18 The Ear PARTFUNCTION Auditory canalCollects vibrations & carries vibration to eardrum EardrumCarries vibration to the middle ear Ossicles– hammer, anvil, stirrup Increases the vibrations & passes them to the oval window Eustachian tubeConnects the middle ear & pharynx Equalises pressure between the middle & outer ear

19 CochleaHearing– contain receptors which are stimulated by pressure waves in lymph. Receptors cause electrical impulses to be sent to the brain along the auditory nerve which interprets them as sound Organ of CortiContains receptors for hearing PinnaCollect and channel vibration into the auditory canal Vestibular apparatusBalance

20 How we hear  Sound waves enter the ear  Eardrum vibrates  Three bones amplify the sound  Oval window vibrates  Liquid in cochlea moves  hair cells stimulated  Auditory nerve carries impulses to the brain  Brain interprets the sound

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22 Glue Ear  Is a hearing disorder  Caused: by too much sticky fluid in the middle ear  Corrected: by decongestants or grommets( small tubes inserted into the eardrum)


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