Colour TEM of photoreceptor cells in snail retina

Colour TEM of photoreceptor cells in snail retina

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This image is part of the feature Snail's Alarm Clock

Credit: H. RAGUET/EURELIOS/SCIENCE PHOTO LIBRARY

Caption: Snail retina cells. Coloured transmission electron micrograph (TEM) of photoreceptor cells in the eye retina of a garden snail. At centre are two photo- receptor cells (yellow) surrounded by supportive cells (blue) and pigment granules (purple dots). Under light, pigment granules move to the centre of the retina enabling the snail eye to absorb light. Researchers B. Buisson & A.Blanc have shown that garden snail biorhythms are under the influ- ence of light. Snails rest by day & are active at night. Light acts on the snail eye which affects brain neurosecretions over 24 hours. These neuro- secretions pass from the brain at night to nerves, reaching muscles by day causing the snail to rest.

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Keywords: (a), anatomy, animal body, animal experiment, biological clock, biorhythm, chronobiology, circadian rhythm, eye, photoreceptors, retina, sight, snail, snail biorhythms, snail eye, snail research, snail retina, vision

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