The Senses.

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Lesson Overview 31.4 The Senses.
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Presentation transcript:

The Senses

cow eye dissection video Eye Anatomy Cornea Outer protective layer Iris Colored part of the eye Contains muscles to open & close the pupil Pupil Size adjusts with light Shrinks in bright light Opens in dim light Lens Focuses light onto the retina Vitreous Gel Fluid filled sac provides nutrients to eye Retina Back of the eye Contains rods & cones Optic Nerve Sends impulses to brain Optic nerve cornea vitreous lens pupil iris retina cow eye dissection video

Vision Process 1) Light passes through pupil #3 #2 #1 1) Light passes through pupil 2) Lens focuses light onto retina 3) Photoreceptors of the retina create impulses 4) Impulse travels up optic nerve to brain

Read the color of the text Read the color of the text

Ear Anatomy Pinna Outer ear Eardrum Amplifies sound by 3 bones: malleus, incus, stapes Cochlea Contains mechanoreceptors (measures pressure)

Sound Transmission 1) Sound waves (vibration of the air) enters the ear canal 2) Eardrum & the small bones vibrate 3) Fluid in the cochlea vibrates 4) Hair cells in the cochlea bend 5) Impulse transmitted through the auditory nerve and to the brain

Cochlear Implants Up to 22 electrodes sending signals to auditory nerve system. http://www.youtube.com/watch?v=LsOo3jzkhYA

Smell & Taste Nose Scent chemicals dissolve in mucus Impulse travels from olfactory nerve to brain Tongue Chemicals dissolve in saliva Chemoreceptors in taste buds creates impulse Sweet, sour, bitter, salty & umami.

Touch, Temperature, Pain Mechanoreceptors in skin sense pressure Upper layer: gentle touches Lower layer: heavy pressure Thermoreceptors & Pain receptors detect temps and chemicals released by damaged cells Impulses sent to brain

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