The Senses.

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Presentation transcript:

The Senses

cow eye dissection video Eye Anatomy Cornea Protective layer of the eye Iris Colored part of the eye Contains muscles to open & close the pupil Pupil Size adjusts with light Small: more light Large: less light Lens Focuses light onto the retina Retina Back of the eye Contains rods & cones 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 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

Smell & Taste Nose Tongue Scent chemicals dissolve in mucus Impulse travels from olfactory nerve to brain Tongue Chemicals dissolve in saliva Chemoreceptors in taste buds creates impulse

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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