The abundant protein in blood,which is arguably the most critical for oxygen homeostasis in the body,is

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Hemoglobin is the abundant protein in blood and is responsible for carrying oxygen from the lungs to the body tissues, and bringing carbon dioxide back to the lungs to be exhaled. Myoglobin is a protein found in muscles and is involved in oxygen storage within muscle cells. Actin and myosin are proteins found in muscle tissue and are involved in muscle contraction. Fibrinogen is a blood clotting protein.

The Abundant Protein in Blood,which Is Arguably the Most Critical