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Image:Internal reflection in semiC glass block.png

Diagram showing rays entering a semicircular glass block. One ray is less than the critical angle one is more. Drawn by Theresa knott.

This diagram was created with the drawing tools that come with Microsoft Word. See Wikipedia:How to draw a diagram with Microsoft Word for advice on how to draw diagrams like this.

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Dendrite

... and without activation of voltage-gated ion channels. In such dendrites the voltage change that results from stimulation at a synapse may extend both towards and away ...