Final answer:
The statement is false. The average ratio of symmetrical synapses to the total synapses in the reconstructed granule cells of a young rat's brain is approximately 0.20, not 0.80.
Step-by-step explanation:
The statement is false. The average ratio of symmetrical synapses to the total synapses in the reconstructed granule cells of a young rat's brain is approximately 0.20, not 0.80. Symmetrical synapses refer to synapses where the pre- and postsynaptic densities are similar in size and shape. Asymmetrical synapses have a larger postsynaptic density compared to the presynaptic density.
However, to provide context on the subject, synapses are structures that permit neurons to pass an electrical or chemical signal to other cells. Synapses do occur where a dendrite and an axon terminal meet, which is indeed correct. On the other hand, neurons may have multiple axon terminals, not just one, which would make the statement about a single axon terminal per neuron false. The biology of glial cells, the spinal cord, and neural circuits are central topics when discussing synaptic connections and neurophysiology.