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.
The Reading Half Marathon is held on the streets of Reading in March of each year, with 16,000 competitors from elite to fun runners. It was first run in 1983 and took place in every subsequent year except 2001, when it was cancelled because of concerns over that year's outbreak of foot-and-mouth disease.