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.
H. Unilateral v. Bilateral contracts. The legal distinction between the two affects revocation (i.e., if all the offeror wants is a return promise, and such a promise is given, revocation becomes impossible; but if the offeror requests an act as an acceptance, then the act itself must be performed or the offeror can still revoke the offer).