vie. vb, vies, vying or vied. 1. (intr; foll by with or for) to contend for superiority or victory (with) or strive in competition (for). 2. (tr) to offer, exchange, or display in rivalry. [C15: probably from Old French envier to challenge, from Latin invÄ«tÄre to invite].
On rare occasions, a halfback is asked to throw the ball when running a HB option. This play is generally referred to as a half-back pass, regardless if the player throwing the football is a tailback or fullback.
A heme unit of human carboxyhaemoglobin, showing the carbonyl ligand at the apical position, trans to the histidine residue. Carboxyhemoglobin or carboxyhaemoglobin (symbol COHb or HbCO) is a stable complex of carbon monoxide and hemoglobin (Hb) that forms in red blood cells upon contact with carbon monoxide (CO). Exposure to small concentrations of CO hinder the ability of Hb to deliver oxygen to the body, because carboxyhemoglobin forms more readily than does oxyhemoglobin (HbO 2). CO is produced in normal metabolism and is also a common chemical.