Retina synapses, light micrograph

Retina synapses, light micrograph

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Caption: Retinal synapses, coloured light micrograph. These synapses are junctions between photoreceptor cells in the eye (top) and nerves that carry the information to the brain. To image the synapses, the neurotransmitter chemical dopamine, used in the synapses, was made radioactive by replacing one of its hydrogen atoms with a radioactive tritium (an isotope of hydrogen) atom. Areas with high dopamine concentration were then detected by measuring radioactivity levels. This is seen by the red band across the retina. Nerve impulses from the retina are sent to the brain, which uses them to create the sense of sight.

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Keywords: anatomical, anatomy, biological, biology, cell, cells, coloured, dopamine, eye, false-coloured, healthy, human body, light micrograph, light microscope, nerve cells, neurological, neurology, neuron, neurons, neurotransmitter, normal, radioactive label, retina, retinal, sight, synapse, synapses, tritium, vision, visual sense

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