Compare and contrast the photoreceptors Property Rods Cones Chromatic or achroma

Question

Compare and contrast the photoreceptors Property Rods Cones Chromatic or achromatic vision Light is absorbed by retinal (yes or no Number of different opsin molecules Light threshold (low or high) Most useful in dim light or bright light Provides low or high visual acuity Present or absent in the macula lutea High or low level of convergence with bipolar cells Physiology of vision Draw a diagram linking light activation of retinal, hyperpolarization of a photoreceptor cell, EPSP formation in the bipolar cells, and action potential in the ganglion cell:

Explanation / Answer

Rods- achromatic, yes light is absorbed by retinal, one opsin receptors, low threshold of light, useful in dim light, low visual acuity, absence from macula densa, low level of convergence of bipolar cells.

Conss,-chromatic, yes, 3 ,opsins, high threshold of light, useful in bright light, high visual acuity, presence at macula densa, high level of convergence

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