Final answer:
The purpose of distal SJ channels is to transmit signals from the distal end of the SJ.
Step-by-step explanation:
The purpose of distal SJ (synaptic junction) channels in transmitting signals is to transmit signals from the distal end of the SJ. Synaptic junctions are the points where neurons connect and transmit signals through the release of neurotransmitters. Distal SJ channels play a crucial role in allowing the electrical signals to pass from the distal end, which is the end farthest away from the neuron's cell body.