Why do mammals yawn?
Yawning helps us bring more oxygen into the blood and move more carbon dioxide out of the blood. ChaCha!
Answered by Shelly F. -
About Blood
The average adult has about five liters of blood inside of their body, coursing through their vessels, delivering essential elements, and removing harmful wastes. Without blood, the human body would stop working. Blood transports oxygen from the lungs to the body’s tissue and carbon dioxide from the body tissue to the lungs. Blood is the fluid of growth, transporting nourishment from digestion and hormones from glands throughout the body. Blood is the fluid of health, transporting disease fighting substances to the tissue and waste to the kidneys.
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