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The Senses

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The Senses - PowerPoint PPT Presentation


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The Senses. 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.

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PowerPoint Slideshow about ' The Senses' - angie


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Presentation Transcript
eye anatomy
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
Vision Process

#3

  • 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

#2

#1

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

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

Transmission

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

Smell & Taste
touch temperature pain
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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