The speed of propagation is related to the size of the axon. The speed of action potential propagation is usually directly related to the size of the axon. Big axons result in fast transmission rates. For example, the squid has an axon nearly 1 mm in diameter that initiates a rapid escape reflex. Increasing the size of the axon retains more of the sodium ions that form the internal depolarisation wave inside the axon.
About the only thing known for sure is that the 119th Boston Marathon will be held on Monday, April 20, 2015. As for everything else, the initial discussions about next year are already underway. But itâs unlikely the race will return with a field of approximately 36,000 runners in 2015.
1 A man comforts a victim on the sidewalk at the scene of the first explosion near the finish line of the 117th Boston Marathon. 2  Medical workers aid injured people at the finish line of the 2013 Boston Marathon following an explosion in Boston. (Charles Krupa/ASSOCIATED PRESS) The two blasts were about 50 to 100 yards apart and came four hours into the race, which had about 23,000 competitors.