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BIO304H5 (88)
B Stewart (32)
Lecture

#18 Vision

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Department
Biology
Course
BIO304H5
Professor
B Stewart
Semester
Fall

Description
VisionDistinct feature between compound eye and vertebrae is multiple lens that orient everywhere compared to single lens that orients with head respectivelyRhabdomere is where the pigments occurRetina is made up of photoreceptor cells Photoreceptor cells send info to back of the eye to optic nerve which goes to brainRods have very low spatial representation More light needed to activate cone cell than rod cell Visual pigments are located in the outer segmentinner segment contains the rest of the organelles for the cellsSynaptic terminal makes contact with the next cell and relays infoPermeability of sodium is almost equal to potassium in darkness In light permeability of sodium decreases and this produces the hyperpolarization seen in the prev
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