Homeostasis refers to the body’s automatic efforts to maintain a constant, normal state of the blood stream. Cannon has described this process for the water content of the blood, salt content, sugar content, protein content, fat content, calcium content, oxygen content, constant hydrogen-ion level and constant temperature of the blood. Obviously this list can be extended to include other minerals, the hormones, vitamins, etc.

The word “maintain” in the passage is closest in meaning to?

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