5th grade- respiratory excretion

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the process of breathing in is called

the exchange of oxygen for carbon dioxide in the lungs takes place in the

tiny blood vessels with very thin walls through which oxygen and nutrients can pass are called

a thick, sticky liquid called mucus is produced by

In a healthy person, all of the blood is cleaned by the kidneys 40 times each day

when red blood cells have given up their oxygen and are traveling back to the heart, their color is

the process of breathing out is called

nutrients are carried in the blood, to the cells by