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 first London Marathon was held on 29 March 1981, more than 20,000 applied to run. 6,747 were accepted and 6,255 crossed the finish line on Constitution Hill. The Marathon's popularity has steadily grown since then. As at 2009, 746,635 people have completed the race since its inception.