Red+Blood+Cells+-+JP

=The secret of Red Blood Cells= =Introduction= toc Red Blood cells are good for your body. This is because they carry oxygen from the lungs and breathe out carbon dioxide through the lungs. Red blood cells make you breathe.

=The job of a red blood cell=

They take up oxygen in the lungs and deliver it to cells in the body. Oxygen is important because the cells need it in order to burn fuel to keep your body alive. They are good for your body because they carry oxygen to the cells and carry carbon dioxide away from the cells. They bring the carbon dioxide back to the lungs and get rid of it.

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= = =How are red blood cells made?=

A red blood cell is made of hemoglobin. //**Hemoglobin**// is an iron containing protein that binds chemically to oxygen molecules. The color changes depending on whether there is a lot of oxygen or little oxygen. If there is oxygen combined with the hemoglobin, the cells are a bright red color. If there is no oxygen, the cells turned dark red.

=Why are red blood cells shaped like a doughnut?=

Under a microscope a red blood cell looks like a jelly doughnut with a center pushed in. The bi-concave shape allows for increased surface area and flexibility as it squeezes through the tiniest of capillaries. This is for delivery of oxygen from the lungs to the body tissues. The oxygen is exchanged for carbon dioxide, the chief waste product of cellular respiration. This waste gets shuttled back to the lungs to be exhaled.

=Why do red blood cells have no nucleus?=

A red blood cell has no nucleus so they can't reproduce. They carry oxygen that burns it into carbon dioxide and you breath it out. They lose their nucleus and other organelles as they develop in the bone marrow. Because they lack a nucleus and other cellular machinery,erythrocytes cannot repair themselves when damaged. Consequently, when they grow up, they lose their nucleus so they can carry more hemoglobin which carries the oxygen.

=What is the job of hemoglobin=

Human **erythrocytes** are produced through a process named erythrocytes, developing from committed stem cells to mature erythrocytes in about 7 days. When matured, in a healthy individual, these cells live in blood circulation for about 100 to 120 days (and 80 to 90 days in a full term infant).

=Conclusion=

Red blood cells make you breathe. They normally last up to 120 days. They have no nucleus, so they can’t reproduce. These cells are made from hemoglobin, and when one cell dies, another one is made to replace it. They carry oxygen from the lungs to all the parts of the body and they breathe out carbon dioxide through the lungs. Your body cannot live without them.

=References=

Works Cited Green, Dan, and Simon Basher. Biology: [life as We Know It!]. New York: Kingfisher, 2008. Print. Life Science: Cells Discovery Education, 2002. Full Video.Discovery Education. Web. 19 December 2014. . Padilla, Michael J. Prentice Hall Science Explorer. Teacher’s ed. Needham: Pearson Prentice Hall,, 2005. Print. Red Blood Cell. Red blood cell. interactive-biology, n.d. Web. 19 Dec. 2014. . “Red Blood Cells Fuction.” Helphyph. sitemap, 2014. Web. 18 Dec. 2014. . “Red Blood Cells: Riding on the Red Road.” The Franklin institute. N.p., 2015. Web. 21 Jan. 2015. .