The systemic circulation is the portion of the circulatory system is the network of veins, arteries and blood vessels that transports blood from heart, services the body's cells and then re-enters the heart, the Mayo Clinic noted. [Image Gallery: The BioDigital Human]
A southern pine (2) 2x12 beam can span 8 feet when supporting joists spanning a maximum of 14 feet, and it can cantilever 2 feet beyond the posts on each side. With the allowable cantilever of the joists, this beam would support a deck 12 feet by 17 1/2 feet.
The design span is the length of the joist measured from the face of the supports at either end. For example, a 10-foot (3.05 m) joist resting on a 6-inch (15.24 cm) wall at either end has a design span of 9 feet (2.743 m).The size and material of a joist is directly related to the span. The maximum length of joists is set by local building codes, and varies widely from city to city.oist span is the distance between the beams, walls, or other structures that support a joist along its length. The total joist span is the distance from one end of the joist to the other.