Sensory receptor cells

Posted on December 3rd, 2009  |  No Comments »
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The sensitivity of the antennae is astounding. The energy of a single photon, the most minute amount of light, is sufficient to stimulate the visual cell. The olfactory cells sense a single molecule of odoriferous substance. For the auditory cell to be excited, it is sufficient for the ear-drum to vi­brate with an amplitude of [...]

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Receptor cells similar in structure

Posted on November 30th, 2009  |  No Comments »
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Scientists have always been eager to understand the structure and function of the sense organs. Research has been especially intense in the past few years, after the elec­tron microscope came on the scene. This is understandable since the ordinary microscope only magnifies ten to fifteen hundred times, while the electron microscope has a magni­fication of [...]

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Sense organs

Posted on November 28th, 2009  |  No Comments »
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How many communication channels does an organism possess? In how many ways can it get information? The receivers for gathering information, the receptors, are what we commonly call the sense organs. Scientists distinguish six sense organs which they consider the prin­cipal ones: those concerned with vision, hearing, equilib­rium, taste, smell and skin sensibility. As for [...]

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That flow of information

Posted on November 28th, 2009  |  No Comments »
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From morning till night, a continuous flow of infor­mation comes to our brain through innumerable communica­tion channels. The acoustic nerve is made up of 30000 conductor fibres, while the optic nerve has even more, about 900000. The amount of information coming in every second from the hearing aid alone is equal to tens of thou­sands [...]

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