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The Senses 35-4. BIO 1004 Flora. Senses. Sensory receptors – react to a specific stimulus such as light or sound by sending impulses to the CNS Sense organs – Eyes Ears Nose Mouth skin. 5 Categories of Sensory Receptors. Pain – located throughout body – except brain

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the senses 35 4

The Senses 35-4

BIO 1004

Flora

senses
Senses
  • Sensory receptors – react to a specific stimulus such as light or sound by sending impulses to the CNS
  • Sense organs –
    • Eyes
    • Ears
    • Nose
    • Mouth
    • skin
5 categories of sensory receptors
5 Categories of Sensory Receptors
  • Pain – located throughout body – except brain
    • Respond to chemicals released by damaged cells
  • Thermo – located in skin, body, and hypothalamus
    • Detect variations in temperature
  • Mechano – skin, skeletal muscle, ears
    • Detect sensation of touch, pressure, and sound
5 categories of sensory receptors1
5 Categories of Sensory Receptors
  • Chemo – Nose/Taste buds – senses to chemicals in the environment
  • Photo – eyes – sensitive to light
vision process
Vision Process
  • Light enters through cornea
    • Cornea – focuses light
  • Light passes through aqueous humor
    • Aqueous humor – fluid chamber
  • Iris – colored disk structure at back of aqueous humor
  • Pupil – small opening in iris
    • Muscles adjust the size of the pupil regulating the amount of light that enters the eye
vision process cont
Vision Process Cont.
  • Lens – behind the iris, helps the eye focus on or near distant objects
  • Vitreous humor – large chamber of the eye that is filled with fluid
  • Retina – light is focused here
    • Photo receptors are located here
  • Optic nerve - carries impulses assembled in the eye to the brain
2 types of photoreceptors
2 Types of Photoreceptors
  • Rods – Sensitive to light, not color
  • Cones – not sensitive to light
    • Responsible for our color vision
hearing and balance
Hearing and Balance
  • 2 Functions of ear
    • Hearing
    • Balance
hearing process
Hearing Process
  • Vibrations enter through auditory Canal
  • Vibrations cause tympanum (ear drum) to vibrate
  • Vibrations are picked up by hammer, anvil, and stirrup
  • Stirrup transmits vibrations to oval window
  • Vibrations cause pressure waves in fluid-filled cochlea
    • Cochlea is lined with hairs that move as a result of the waves, thus sending nerve impulses to the brain through cochlear nerves
balance
Balance
  • Semicircular Canals – monitor position of the body in relation to gravity
  • Process:
    • Fluid in canals changes with position of head
    • Fluid moving causes hairs to bend and send impulses to brain that determine body position
smell taste and touch
Smell, Taste, and Touch
  • Chemoreceptors in nasal passages respond to chemicals and communicate with the brain
  • Taste of food is actually smell (hold nose when you eat)
  • Taste buds – sense organ
  • Skin – largest sense organ
    • Contains the most sensory receptors that respond to temp, pain, and touch
      • Face, fingers, and toes have the most
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