AN SC 310 - 10

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Author:
ebacker
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188329
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AN SC 310 - 10
Updated:
2012-12-10 00:50:17
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AN SC 310
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Description:
Lecture 10 - Sensory Receptors and Vision
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  1. What somatic sensations are part of the PNS?
    • Somesthetic (skin)
    • Proprioception (limbs/body position)
  2. What special senses are part of the PNS?
    • Vision
    • Hearing
    • Taste
    • Smell
    • Equilibrium
  3. What is a sensory receptor?
    Specialized nerve ending or seperate cell that detects a sensory stimulus.
  4. What are the different classifications of sensory receptors?
    • Photoreceptors
    • Chemoreceptors
    • Thermoreceptors
    • Mechanoreceptors
  5. What is transduction
    Conversion of stimulus energy to electrical energy
  6. What is the Law of Specific Nerve Energies?
    • Receptors show specificity to one modality
    • Ex. nerves in tongue cannot smell
  7. Define receptor potentials
    Change in membrane potential in response to a stimulus acting on a sensory receptor
  8. What are some properties of receptor potentials?
    • Graded
    • Caused by opening/closing of ion channels
    • > threshold can generate AP
    • 1. Sclera
    • 2. Cornea
    • 3. Choroid
    • 4. Ciliary body
    • 5. Iris
    • 6. Retina
    • 7. Fluid filled
  9. What are the 3 components of the iris?
    • Constrictor - inner circular muscle
    • Dilator - outer radial muscle
    • Pupil - opening in the center
  10. Where are rods and cones present in the greatest amounts in the retina?
    • Cones: fovea, and periphery
    • Rods: beside fovea, and periphery
  11. How are the 4 different opsins distributed?
    • Rods - 1 (black/white)
    • Cones - 3 (red, green, blue)
  12. What is the difference btwn rods and cones?
    • Rods - high sensitivity to light, scotopic vision (night)
    • Cones - low sensitivity to light, photopic vision (day)
  13. What 3 combinations of color cancel e/o?
    • Red/Green
    • Blue/Yellow
    • Black/White
  14. What is rod "bleaching"?
    • Exposure to light
    • Retinal seperates from opsin
    • No more light can be absorbed
    • Move to dark, retinal & opsin reassociate, can see again

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