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.
1. Lower your level of training the week before you run a half marathon. Reduce the distance of your runs to 2 to 4 miles (3.2 to 6.4 km) each, and spend less time cross training.t 13.1 miles (about 21 km), a half marathon can be a highly rewarding challenge for athletes of any level. Half marathons are a popular choice for experienced runners preparing for their first marathon, but are an attainable goal for novice runners as well.