Humerus is the bone of arm , it connects the shoulder joint (scapula) to the elbow joint (ulna&radius) , it (with muscles) forms the main bulk of the upper arm .             Humerus is a bone that is found in the arm and it help you to move your arm so you can pick stuff up.
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What is PEX tubing? PEX (crosslinked polyethylene) tubing is a specially designed plastic tubing with distinctive properties that make it ideal for radiant floor heating and plumbing systems. Uponor produces PEX-a tubing, which is considered the superior type of PEX. What is Wirsbo hePEXâ¢? Wirsbo hePEXâ¢ is crosslinked polyethylene (PEX-a) heat-transfer tubing that features a patent-pending oxygen-barrier coating technology for closed-loop hydronic heating and cooling applications.