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Red blood cells are red because of hemoglobin. Within hemoglobin there are these groups called heme. These heme groups are red and plentiful and because there are so many of them it makes our blood look red. Going even deeper, hemes are red because at its center there is an iron molecule which makes the heme look red- brown.

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Eun Kang                                The reason why are blood cells are red is because of Hemoglobin. Hemoglobin has four protein chains that each bind an additional ring shaped chemical called Heme. Our blood is red because the millions of red blood cells it contains. 

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Eun Kang                                The reason why are blood cells are red is because of Hemoglobin. Hemoglobin has four protein chains that each bind an additional ring shaped chemical called Heme. Our blood is red because the millions of red blood cells it contains. 

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Blood cells are red because of the protein hemoglobin, which contain red-colored compound called heme that's crucial for carring oxygen through your bloodstream.

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Our blood cells are red because of hemoglobin. They have iron in the middle of the heme which forms a reddish-brownish color.

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The red blood cells we have is  formed in the red bone which is marrow of bones something called hemocytoblast gives a rise to all the forms in the pigment color.

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red blood cells contain a molecule that gives them their distinctive color. The molecule is called hemoglobin, which binds and transports oxygen through our bodies. Hemoglobin is made up of four protein chains that each bind an additional ring-shaped chemical structure called heme. Because of the "heme groups" in hemoglobin, our blood is red.

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Our red blood cells are red because of the heme groups in hemoglobin.

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Our blood is red because of heme groups in hemoglobin. There is iron in the middle of the heme which makes it look red-brown

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Blood is red due to our red blood cells being made of a molecule called hemoglobin. Hemoglobin is made of four protein chains which each link to another structure called heme. The heme groups cause the red color in the blood cells, which cause our blood as whole to look red.

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The reason that blood is red is because of heme which is structures in the hemoglobin that makes up our red blood cells.

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Blood is red because of the hemoglobin in our blood that transports oxygen and with all the blood cells that are red just takes up the color.

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One of the ingredients of red blood was hemoglobin which the structure of it makes the red-brownish color because of the iron and the heme

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I think the most important thing that was stated in the article was "In order to bind oxygen, each protein chain binds to one heme group, allowing a maximum of four oxygen molecules to bind per one hemoglobin molecule."

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Our red blood cells are red because of the heme groups in hemoglobin.. At heme's center sits an iron molecule. The iron makes heme look red-brown.

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Red blood cells contain a molecule called hemoglobin, which binds and transports oxygen through our bodies. When the blood cells react with oxygen they turn red.

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Our red blood cells are red because of the heme groups in hemoglobin.

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our blood is red because of heme groups in hemoglobin. Iron is in the middle of the heme making it look reddish brown.

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Our blood is red because of the molecule in our red blood cells called hemoglobin which is made up of four protein chains called heme. Our blood contains millions of red blood cells that make our blood red.

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Blood is red because blood contains a protein called hemoglobin that causes it to turn red.

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Red blood cells contain a molecule called hemoglobin, which binds and transports oxygen through our bodies. Hemoglobin is made up of four protein chains that each bind an additional ring-shaped chemical structure called heme. At heme's center sits an iron molecule. The iron makes heme look red-brown.

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Blood is red because of the hemoglobin protein, it contains a red color compound in it and when it has a reaction with oxygen it turns the color red.

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Our blood is red because of the heme groups in hemoglobin. Simply put, our blood is red because of the millions of red blood cells that is contains. An iron sits in the center of the heme, this iron is what makes the heme a reddish-brown color.

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Blood is red because it has a pigment that has a reddish color that is essential for delivering oxygen to the body.

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Blood is red because it has a protein that has a red coloring and is crucial for transporting oxygen to your body.

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Eugenia Grant                                 The blood is red because of the protein hemoglobin which contain red colored compound            

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Eugenia Grant                                 The blood is red because of the protein hemoglobin which contain red colored compound            

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Blood is red because its all down to some colorful chemistry in your red blood cells. red blood cells contain a molecule that gives them their distinctive color.

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Our red blood cells are red because of the heme groups in hemoglobin. In turn, our blood is red because of the millions of red blood cells that it contains.

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Why is blood red? Published Friday 30 June 2017by Yella Hewings-Martin PhD

Have you ever wondered why scarlet blood pours out of your nose when you experience a nosebleed? Or why the veins in your skin look blue? It's all down to some colorful chemistry in your red blood cells.  Red blood cells contain a molecule that gives them their distinctive color.

Red blood cells contain a molecule called hemoglobin, which binds and transports oxygen through our bodies. Hemoglobin is made up of four protein chains that each bind an additional ring-shaped chemical structure called heme.

Our red blood cells are red because of the heme groups in hemoglobin. In turn, our blood is red because of the millions of red blood cells that it contains. Color plays an important role in many aspects of biology, explain the authors of a recent review article published in the journal Archives of Pathology & Laboratory Medicine.

Here, Dr. Sergio Piña-Oviedo, of the Department of Hematopathology at the MD Anderson Cancer Center in Houston, TX, and colleagues discuss the relevance and biochemistry of color in human organs.  Color is important for "camouflage and protection, metabolism, sexual behavior, and communication," they explain.

Metals matter The protein chains in the hemoglobin molecule in red blood cells are encoded by our genes. Mutations in the globin genes can cause diseases such as thalassemia and sickle cell disease. In order to bind oxygen, each protein chain binds to one heme group, allowing a maximum of four oxygen molecules to bind per one hemoglobin molecule. At heme's center sits an iron molecule. The iron makes heme look red-brown.