AN SC 310 - 10
Card Set Information
AN SC 310 - 10
AN SC 310
Lecture 10 - Sensory Receptors and Vision
What somatic sensations are part of the PNS?
Proprioception (limbs/body position)
What special senses are part of the PNS?
What is a sensory receptor?
Specialized nerve ending or seperate cell that detects a sensory stimulus.
What are the different classifications of sensory receptors?
What is transduction
Conversion of stimulus energy to electrical energy
What is the Law of Specific Nerve Energies?
Receptors show specificity to one modality
Ex. nerves in tongue cannot smell
Define receptor potentials
Change in membrane potential in response to a stimulus acting on a sensory receptor
What are some properties of receptor potentials?
Caused by opening/closing of ion channels
> threshold can generate AP
4. Ciliary body
7. Fluid filled
What are the 3 components of the iris?
Constrictor - inner circular muscle
Dilator - outer radial muscle
Pupil - opening in the center
Where are rods and cones present in the greatest amounts in the retina?
: fovea, and periphery
: beside fovea, and periphery
How are the 4 different opsins distributed?
Rods - 1 (black/white)
Cones - 3 (red, green, blue)
What is the difference btwn rods and cones?
Rods - high sensitivity to light, scotopic vision (night)
Cones - low sensitivity to light, photopic vision (day)
What 3 combinations of color cancel e/o?
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