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.
Beam: 4x10. Joists span up to: 12'. Beam span: 7'. The required width of a joist depends on its span -- how far it must travel between beams or between a beam and a ledger. It also depends on the joist spacing; for instance, joists that are placed 24 inches apart must be wider than joists placed 16 inches apart.