Abstract
Intracellular O2 concentrations in humans and other mammals are maintained within a relatively narrow range, with partial pressures of O2 varying between a high of approximately 110mmHg, (16% O2 at sea level) in the pulmonary alveoli to a low of less than 20mmHg. (3% O2) in some areas of the heart, kidney, and brain. The physiological O2 concentration within any cell reflects the net effect of O2 delivery and O2 consumption and is associated with adaptive intracellular responses to protect against the deleterious effects of O2 deprivation (hypoxia) or O2 excess (hyperoxia). Oxygen homeostasis thus reflects the requirement for O2 as a substrate for essential biochemical reactions, most notably oxidative phosphorylation, which is balanced by the risk of oxidative damage to cellular macromolecules. The molecular mechanisms underlying homeostatic responses to hypoxia represent the central focus of this volume.
Original language | English (US) |
---|---|
Title of host publication | Oxygen Sensing |
Subtitle of host publication | Responses and Adaption to Hypoxia |
Publisher | CRC Press |
Pages | 1-5 |
Number of pages | 5 |
ISBN (Electronic) | 9780824748456 |
ISBN (Print) | 9780824709600 |
State | Published - Jan 1 2003 |
ASJC Scopus subject areas
- General Medicine