Sure, here’s how you can complete the statements with the correct parts of a neuron and other components involved in the reflex action:
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Information enters the neuron through structure A: dendrites.
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Information passes through structure B: the cell body (or soma) to reach structure D: the axon.
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Information leaves the neuron through structure C: axon terminals.
For the scenario with Santi stepping on a sharp rock:
Santi is walking barefoot through his yard when he steps on a sharp rock. The skin on the bottom of his foot sends this information through a(n) sensory neuron to his spinal cord. A(n) receptor picks up this information and carries it to a(n) interneuron, which sends a signal to the muscles in his foot causing his foot to pull away from the rock.
(Note: In some contexts, the "interneuron" may be considered part of the spinal cord, which plays a role in processing the reflex action.)