* Hemoglobin: Found in red blood cells, hemoglobin is a protein that binds to oxygen in the lungs and transports it throughout the body.
* Myoglobin: Similar to hemoglobin, myoglobin is found in muscle tissue and stores oxygen for use during exercise.
* Water: While not a strong absorber, water can dissolve some oxygen, making it available for aquatic life.
* Metals: Certain metals, like iron and copper, can react with oxygen to form oxides.
* Activated Carbon: This material has a high surface area and can adsorb oxygen molecules onto its surface.
* Enzymes: Some enzymes, like cytochrome c oxidase, are involved in cellular respiration and utilize oxygen as a reactant.
The specific substance that absorbs oxygen will depend on the context and the purpose of the absorption.
