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The Senses

The Senses. Eye Anatomy Sense: Vision. 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

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The Senses

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  1. The Senses

  2. Eye AnatomySense: Vision • 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 • Optic Nerve • Sends impulses to brain

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

  4. Read the color of the text Read the color of the text

  5. Ear AnatomySense: Hearing • Pinna • Outer ear • Eardrum • Amplifies sound by 3 bones: malleus, incus, stapes • Cochlea • Contains mechanoreceptors (measures pressure)

  6. SoundTransmission 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

  7. Sound Transition Animation

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

  9. Sense: Touch (Temperature, Pain, Pressure) • 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

  10. REview • Name the 5 senses. • Label the diagram of the eye. • Which eye part: • Protects the outer eye? • Contains rod and cone cells? • Focuses light? • Name the three bones behind the ear drum? • Name the bone of the ear that has hair cells. • Which sense is: • related to the optic nerve? • related to the olfactory nerve? • related to the auditory nerve? • Which receptors detect temperature changes?

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