Please Help! - Name the cellular component of the circulatory system which is involved in oxygen transport?

Please Help! - Name the cellular component of the circulatory system which is involved in oxygen transport?
Thank you!

Oxygen is transported through the circulatory system by red blood cells (erythrocytes). The reason the erythrocytes are known as red blood cells is because of a substance called hemoglobin. Hemoglobin is composed of simple protein and iron pigments and when combined with oxygen their color becomes a bright scarlet.

See: http://web.buddyproject.org/web019/web019/blood.html
for more information about components of blood.

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