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 […]

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 […]