BIOL373L Study Guide - Final Guide: Plantar Reflex, Pupillary Light Reflex, Bile Acid
22 Aug 2016
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Introduction: special senses: depend on complex organs which contain large numbers of individual sensory receptor cells. Adapting sensors: tonic (slow) produces a continuous sequence of action potentials as long as the stimulus lasts. Phasic (rapid) sends a stream of action potentials of steadily decreasing frequency. Vision: visual acuity is the degree of detail the eye can distinguish, it is determined by the snellen chart. Myopia is near sightedness , far objects are blurry. Hyperopia is far sightedness , close objects are blurry. Astigmatism is the blurring or distortion of the visual image caused by a defective curvature of the eye"s surface. Colour blindness is caused by the deficiency of the retina"s system for converting light into receptor potentials, it is determined by the ichikawa colour vision test. Taste: taste buds consist barrel-shaped groupings of sensory cells located on the tongue and in the epithelial lining of the mouth.
