FIGURE 1-11 Body Cavities. (a) The dorsal body cavity is bounded by the bones of the skull and vertebral column. The muscular diaphragm divides the ventral body cavity into a superior thoracic (chest) cavity and an inferior abdominopelvic cavity.he Thoracic Cavity The walls of the thoracic cavity surround the lungs and heart; associated organs of the respiratory, cardiovascular, and lymphatic systems; the inferior portions of the esophagus; and the thymus.
Half marathon. A half marathon is a road running event of 21.0975 kilometres (13.1094 mi) â half the distance of a marathon. Participation in half marathons has grown steadily since 2003, partly due to the fact that it is a challenging distance, but does not require the same level of training that a marathon does.
This can be answered in various ways. To a track athlete, long distance running is anything that is 3 miles or over. However for a marathoner the answer is usually anything over 10 miles. In marathon and half marathon training, the main portion of your training is the long run. This is usually anything over 6-10 miles. The idea behind these long distance runs is to build endurance. Without endurance there can be no marathon or half marathon. A marathon tests your endurance and if you have built up not only your body but also your mind to go the distance you will be successful in the marathon training.