Any Process That Results in a Change in State or Activity of a Cell or an Organism (in Terms of Movement Secretion Enzyme Production Gene Expression Etc.) As a Result of a Stimulus Indicating Lowered Oxygen Tension. Hypoxia Defined As a Decline in O2 Levels Below Normoxic Levels of 20.8 20.95% Results in Metabolic Adaptation At Both the Cellular and Organismal Level.
The Directed Movement of Substances (such As Macromolecules Small Molecules Ions) Into Out of or Within a Cell or Between Cells or Within a Multicellular Organism by Means of Some Agent Such As a Transporter or Pore.
The Process Whose Specific Outcome Is the Progression of the Heart Over Time From Its Formation to the Mature Structure. the Heart Is a Hollow Muscular Organ Which by Contracting Rhythmically Keeps Up the Circulation of the Blood.
The Process in Which a Relatively Unspecialized Cell Acquires Specialized Features of a Brown Adipocyte an Animal Connective Tissue Cell Involved in Adaptive Thermogenesis. Brown Adipocytes Contain Multiple Small Droplets of Triglycerides and a High Number of Mitochondria.