the process by which the sensitivity to a certain stimulus is modified by previous exposure is...
DESCRIPTION
T F In order for taste and/or olfaction to occur, the chemical being sensed must be first be in solution.TRANSCRIPT
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The process by which the sensitivity to a certain stimulus is modified by previous exposure is called sensory __________.
A) transductionB) adaptationC) modulationD) amplificationE) range fractionation
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Each taste bud is composed of taste cells, supporting cells, and basal cells.
A) TrueB) False
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T F In order for taste and/or olfaction to occur, the chemical being sensed must be first be in solution.
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Outline
I. How do our eyes sense light
II. How our eyes adapt to the light & dark
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Backof Eye
Frontof Eye
BipolarCells
Rods &Cones
GanglionCells
Choroid
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Frontof Eye
Backof Eye
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Visual Pathway of the Retina• Rods & Cones
– Photoreceptors of eye– some convergence occurs– 100 million rods/eye– 3 million cones/eye
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Visual Pathway of the Retina• Rods & Cones
– Photoreceptors of the eye– some convergence occurs– 100 million rods in each eye– 3 million cones in each eye
• Bipolar cells– synapse with ganglion cells– large amount of convergence
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Visual Pathway of the Retina• Rods & Cones
– Photoreceptors of the eye– some convergence– 100 million rods in each eye– 3 million cones in each eye
• Bipolar cells– synapse with ganglion cells– lots of convergence
• Ganglion cells– axons of these form optic nerve– more convergence
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Rod
Rods:• High sensitivity• Low acuity• Allow “night vision”• Outside fovea
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Rod Cone
Rods:• High sensitivity• Low acuity• Allow “night vision”• Outside fovea
Cones:• Low sensitivity• High acuity• Allow color vision• Mainly in fovea
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Rod and Cone Distribution in Eyes
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Structure of a Rod
Outer Segment(contains photopigment)
Inner Segment
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Photopigments: Light-sensitive Proteins• Photopigment of rods is ____________
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Photopigments: Light-sensitive Proteins• Photopigment of rods is ____________
• Photopigments have two parts:1) protein called opsin2) derivative of vitamin A called retinal
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Photopigments: Light-sensitive Proteins• Photopigment of rods is ____________
• Photopigments have two parts:1) protein called opsin2) derivative of vitamin A called retinal
• Cones contain photopsin– Opsins have different amino acids that determine
which wavelengths are absorbed– Red, green, and blue cones absorb red, green, and
blue light, respectively
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Selectivity of Rods & Cones
Rods are generalists
Cones are specialists - Blue cones - Green cones - Red cones
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Cone Absence leads to Colorblindness
Red-Green Colorblindness:results from absence of red or green cones in retina
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Transduction in Rods and Cones• In complete darkness, rods and cones are
___________ by influx of Na+
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Transduction in Rods and Cones• In complete darkness, rods and cones are
___________ by influx of Na+
• Send IPSP’s to bipolar neuron
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Transduction in Rods and Cones• In complete darkness, rods and cones are
___________ by influx of Na+
• Send IPSP’s to bipolar neuron
• Light stimulates breakdown of photopigments
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Transduction in Rods and Cones• Photopigment breakdown results in the closing
of Na+ channels
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Transduction in Rods and Cones• Photopigment breakdown results in the closing
of Na+ channels
• IPSP’s stop
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Total Dark
Na+ Influx(depolarization)
No AP to Ganglion Cell
IPSP’s to Bipolar Neuron
No AP to Visual Cortex
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Total Dark
Na+ Influx(depolarization)
No AP to Ganglion Cell
IPSP’s to Bipolar Neuron
No AP to Visual Cortex
Light
PhotopigmentBreakdown
Na+ channelsClose
Stop IPSP’s to BPN
AP sent to Ganglion Cell
AP sent toVisual Cortex
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Outline
I. How do our eyes sense light
II. How our eyes adapt to the light & dark
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Light/Dark Adaptation of Eyes
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• Visual sensitivity depends on concentration of photopigments
Dark Adaptation of Eyes
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• Visual sensitivity depends on concentration of photopigments
When first entering the dark theatre, you see:
Dark Adaptation of Eyes
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• Photopigments broken down by light
Dark Adaptation of Eyes
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• Photopigments broken down by light
• Photopigments regenerated in the dark (created faster than broken down)
Dark Adaptation of Eyes
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• Photopigments broken down by light
• Photopigments regenerated in the dark (created faster than broken down)
• Highly-sensitive rods “turned on”
Dark Adaptation of Eyes
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Light Adaptation of Eyes
When leaving the theater ….
• Eyes highly sensitive to bright light
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Light Adaptation of Eyes
• Photopigments break down
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Light Adaptation of Eyes
• Photopigments break down
• Light sensitivity decreases
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Light Adaptation of Eyes• Photopigments break down
• Light sensitivity decreases
• Rods “burned out” as rhodopsin is broken down
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Light Adaptation of Eyes• Photopigments break down
• Light sensitivity decreases
• Rods “burned out” as rhodopsin is broken down
• Brain switches vision from _____ to _____
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Changes in Pupil Size• Circular and Radial Muscles
• Pupil size controlled by sympathetic and parasympathetic nervous stimulation
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Dude, What Just Happened?
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Summary
• Rods allow high sensitivity/low acuity night vision; Cones allow low sensitivity/high acuity daylight vision
• Vision is somewhat counterintuitive
• Photopigment breakdown and regeneration, change in pupil diameter, and switching of photoreceptor type allows for light/dark adaptation of the eyes