Oxygen is transported to body cells by binding to hemoglobin in red blood cells, which are carried through the bloodstream to tissues where oxygen is released for cellular respiration.
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Cells need oxygen for the functions of mitochondria, which are involved in energy production.
Blood collects waste from all parts of the body and carries it to the liver and kidneys for disposal.
Muscle cells facilitate movement through their contraction and relaxation.
Muscle cells are responsible for the movement of our chest during breathing, as their contraction and relaxation cause the chest to expand and contract, facilitating the process of inhalation and exhalation.