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Because your cells need oxygen. Blood has Hemoglobins inside it, which carry oxygen.
Cyanide blocks your ability to metabolize oxygen inside your cells.
Hydra cells get oxygen through diffusion.
Oxygen is needed for respiration. This is how all our cells release energy. All the body cells and white blood cells therefore need oxygen. Red blood cells don't use oxygen, they undergo anaerobic respiration, but they transport the oxygen needed by other cells.
The enzyme catalase causes the decomposition of water into hydrogen and oxygen inside cells.
Catilage
lacunae
In bone the cells that occupy the lacunae are osteocytes.
Lacunae
in bones nerve's are found inside the harvesian canal and bone cells are present inside the lacunae surrounding the harvesian system.
The body cells keep you warm.
lacunae
Sponges get oxygen by taking water through it's pores. The water moves over cells inside the sponge and oxygen in the water moves into the sponge's cells.
Osteocytes
Blood gets oxygen in the cells. This is part of the body system.
Red blood cells carry oxygen to tissue and circulate back to the lungs to receive more oxygen.
Mature bone cells within the matrix are called osteocytes.