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.
A half distance triathlon, also known as âmiddle distanceâ and sometimes referred to as a 70.3 (named for the total number of miles travelled) covers, as the name suggests, half the distance of the Iron-man. The required distances are a 1.93 km (1.2 miles) swim, a 90 km (56 miles) cycle and 21.9 km (13.1 mile) run.he Olympic distance triathlon, also known as âinternational distanceâ requires a 1.5 km (0.93 mile) swim, a 40 km (24.8 mile) cycle and a 10 km (6.2 mile) run.