What are the processes that does not depend on respiration in human?

BREATHING—what could be more natural? Most of us rarely give it a thought. Breathing, however, could not keep us alive if it were not for the human hemoglobin molecule, a complex molecular masterpiece designed by our Creator. The hemoglobin that is inside each of our 30 trillion red blood cells transports the oxygen from the lungs to the tissues throughout the body. Without hemoglobin, we would die almost instantly.
How do hemoglobin molecules manage to pick up tiny oxygen molecules at the right time, hold them safely until the right time, and release them at the right time? Several amazing feats of molecular engineering are required.
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