Illustration of pain receptors.

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Illustration of pain receptors. A presynaptic neuron releases pain neurotransmitters (red spheres), which connect to the receptors of the synapse. To counteract this, a neuron will secrete endorphins (blue spheres), which bind to receptors, blocking pain neurotransmitters from binding with the receptors.

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Size: 2760px × 3540px
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Photo credit: © Science History Images / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: -dimensional, 3, 3-, 3-dimensional, 3d, dimensional