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Illustration of the human reflex arc

Illustration of the human reflex arc

P320/0020

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53.0 MB (2.0 MB compressed)

4989 x 3713 pixels

42.2 x 31.5 cm ⏐ 16.6 x 12.4 in (300dpi)

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Credit

FRANCIS LEROY, BIOCOSMOS / SCIENCE PHOTO LIBRARY FRANCIS LEROY, BIOCOSMOS / SCIENCE PHOTO LIBRARY

Caption

Reflex arc. Illustration of a human reflex arc. Sensory nerve endings (lower right) detect a stimulus, such as pain. The nervous signal passes along the sensory nerve cell fibre to the spinal cord (left), where synapses transmit the signal to a motor nerve cell via an interneuron. The sensory nerve cell body is shown at centre left in a ganglion just outside the spinal cord. The motor nerve cell transmits the signal to an appropriate effector organ, in this case a muscle in the arm. Reflexes like this happen involuntarily, before the brain has had time to receive or interpret the stimulus.

Release details

Model release not required. Property release not required.

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