Definition [edit]. Hypoxemia refers to low oxygen in the blood, and the more general term hypoxia is an abnormally low oxygen content in any tissue or organ, or the body as a whole.Hypoxemia can cause hypoxia (hypoxemic hypoxia), but hypoxia can also occur via other mechanisms, such as anemia.ypoxemia (or hypoxaemia in British English) is an abnormally low level of oxygen in the blood.
At first glance, the most obvious difference between bilateral and unilateral contracts is the number of people or parties promising an action. Bilateral contracts need at least two, while unilateral contracts only obligate action on one part. The other differences might be a bit more subtle.
A unilateral contract is a legal agreement in which one party to the contract promises to take a specific action if the other party proactively takes, or refrains from taking, a specific action. For example, one party may contract to pay the other $100 if the other party walks one mile or refrains from walking one mile for a period of one week.