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Important Facts Myoglobin is a protein found in muscle cells which works as an oxygen storage unit and also provides oxygen to the body's muscles. Whales (as well as other diving animals) stay submerged because they have more myoglobin in their blood. There are many factors which control the blood's circulation. The main factors are the body's temperature, the oxygen supply, or the excitement of the whale. The blood circulation in whales is controlled mainly by nerve connections, sensory receptors in the brain and hormones. HomeNext
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