Answer :
Hemoglobin: The protein inside red blood cells (a) that carries oxygen to cells and carbon dioxide to the lungs is hemoglobin (b). Hemoglobin is made up of four symmetrical subunits and four heme groups. Iron associated with the heme binds oxygen. It is the iron in hemoglobin that gives blood its red color.
Blood vessels are narrow channels that transport oxygen-rich blood to all body tissues. Arteries are major blood vessels that transport blood from the heart to the rest of the body.
- The transport tubes above described are known as blood vessels and arteries.
- There are more than 20 major arteries in the human body.
- These arteries branch out into arterioles and capillaries.
In conclusion, the transport tubes above described are known as blood vessels and arteries.
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