why are red blood cells formed?
445725
DEVIL is partially correct.  Red blood cells are used to transport oxygen.  They also carry carbon dioxide.  Red blood cells are like little delivery vehicles.  They pick up and deliver oxygen to where it's needed and return carbon dioxide to the lungs to be exhaled.
622289
Sickle cell anemia is a hereditary disorder that mostly affects people of African ancestry, but also occurs in other ethnic groups, including people who are of Mediterranean and Middle Eastern descent. More than 70,000 Americans have sickle cell anemia. And about 2 million Americans - and one in 12 African Americans - have sickle cell trait (this means they carry one gene for the disease, but do not have the disease itself). \n\nSickle cell anemia occurs when a person inherits two abnormal genes (one from each parent) that cause their red blood cells to change shape. Instead of being flexible and round, these cells are more rigid and curved in the shape of the farm tool known as a sickle - that's where the disease gets its name. The shape is similar to a crescent moon.\n\nWhat Is Sickle Cell Anemia? \nSickle cell anemia is a blood disorder that affects hemoglobin (pronounced: hee-muh-glow-bin), a protein found in red blood cells that helps carry oxygen throughout the body. \n\nRed blood cells with normal hemoglobin (HbA) move easily through the bloodstream, delivering oxygen to all of the cells of the body. Normal red blood cells are shaped like doughnuts with the centers partially scooped out and are soft and flexible. \n\nSickle cell anemia occurs when an abnormal form of hemoglobin (HbS) is produced. HbS molecules tend to clump together, making red blood cells sticky, stiff, and more fragile, and causing them to form into a curved, sickle shape. Red blood cells containing HbS can go back and forth between being shaped normally and being sickle shaped until they eventually become sickle shaped permanently. Instead of moving through the bloodstream easily, these sickle cells can clog blood vessels and deprive the body's tissues and organs of the oxygen they need to stay healthy. \n\nUnlike normal red blood cells that last about 4 months in the bloodstream, fragile sickle cells break down after only about 10 to 20 days, which usually causes anemia. Anemia (pronounced: uh-nee-mee-uh) is what happens when the body's number of red blood cells (or amount of hemoglobin) falls below normal. People who are anemic often feel weak and tire more easily.\n\nPeople with sickle cell anemia can also experience complications from blood circulation and infection-fighting problems. These include a higher risk of certain infections and stroke as well as a condition called acute chest syndrome, which is caused by infection or trapped red blood cells in the lungs.\n\nSickle cell anemia is not contagious, so you can't catch it from someone else or pass it to another person like a cold or other infection. People with sickle cell anemia have inherited two sickle cell genes, one from each parent. A child who has inherited the sickle cell gene from only one parent will not develop the disease, but will have sickle cell trait. People who have sickle cell trait don't have sickle cell anemia or symptoms of the disease, but they can pass the sickle cell gene to their own children.\n\nBecause people with sickle cell trait don't have the disease, they may never discover that they carry the gene. That's why it's recommended that teens who are unsure of their sickle cell status ask their doctors about testing. The National Institutes of Health recommends that all newborns be screened for sickle cell disease, and testing at birth is now required in almost every state. This helps infants with sickle cell anemia get the care and treatment they need right away.
321540
An erythrocyte ( red blood cell ) is about 7 MICROMETRES in diameter i.e. 0.000 007 m   -->  7x10^-6 m\n\nPLEASE NOTE nanometres are a billionth of a metre i.e. a thousandth of a micrometre!!\n\nAn atom is about 0.2nm in diameter - the haemoglobin molecule itself is made of hundreds of atoms, and there are about 250,000 haemoglobin molecules in an erythrocyte!!\n\nNO CELL IS SMALLER THAN ABOUT 0.5 micrometre!!!
576421
Ermm, the fact that cells are the smallest building blocks of life is the reason that we see things as they are.\n\nThe basis is that all cells contain life and they make what is specified in their DNA/RNA. Heart cells make hearts, lung cells -> lungs, blood cells -> red or white, skin cells -> skin..you get the idea.\n\nI hope I have answered your question, or at least to a certain extent.
677884
At birth, all bone marrow is red. As we age, most of it is transformed into yellow marrow by the addition of fat cells. Red marrow produces red blood cells, platelets, and certain white blood cells. It fills the cavities of many bones, especially long bones. By adolescence, most of our marrow is yellow. In an adult, red marrow is only found on the proximal epiphysis of long bones, in vertebral bodies, sternum, ribs, and bones of the cranium. If necessary, yellow marrow can be stimulated to produce new red blood cells. Red blood cells only live about 120 days, after which they are replaced and recycled. Every day, the liver destroys about the same number of red blood cells as bone marrow creates to maintain a balance.
632354
I think it's protein. Because most of the human organ need protein to be form. The human organ, including heart are consist of cells, and they need protein to regenerate, I think this also happens when they were formed in fetus period.
557310
All the cellular components of the blood derive from the bone marrow. Erythroid progenitors give rise to red cells, megakaryocytes split themselves into tiny pieces to give platelets, and hematopoyetic pluripotent stem cell progenitors give rise to myeloid and lymphoid progenitors The first of them give rise to granulocytes (mastocytes, eosinophyls, basophyls and neutrophyls) and monocytes (which later become macrophages). The lymphoid progenitors give rise to T and B lymphocytes.
460458
Mature red blood cells lack a nucleus, and muscle cells have several nuclei per cell.
875930
RBCs are unable to synthesize new proteins to grow or divide. They become old as they lose their flexibility and become increasingly rigid and fragile and their contained hemoglobin begins to degenerate. RBCs have a lifespan of 100-120 days and after they become trapped and fragmented into smaller circulatory channels particularly of those in the spleen. Dying erythrocytes or RBCs are engulfed and destroyed by macrophages of the spleen liver and bone marrow. The heme of their hemoglobin is split off from the globin. Its core of iron is salvaged, bound to protein as ferritin or hemosiderin and stored fro reuse. The balance of the heme group is degraded to bilirubin , a yellow pigment that is released to the blood and binds to albumin for transport.
500857
Basically there are numerous cells in the body composing of white blood cell and red blood cell
771161
The red blood cells contain SS hemoglobin, an abnormal form, and will go into crisis with sludging of blood in small arteries and arterioles throught the body causing severe pain and often death if not treated properly.
498701
Actually, red blood cells DO have a nucleus, but platelets do not.  It's easy to get them confused.  All other cells in a mammal's body contain at least one nucleus (some cells of the immune system can actually have multiple nuclei).
287521
if you're not making red blood cells, there may be a problem with your bone marrow - bone marrow is where you synthesize new red blood cell. Don't worry. Talk to your doctor about it & ask them about a drug called Erythropoietin Alpha. It's a synthetic form of a hormone that your body produces to stimulate the production of ned RBCs. \n\nGood luck. Also, eat plenty of red meat!
932652
Blood contains not only red and white cells, but other cells called platelets.  Their function is to gather at the site of an injury and clump the other blood cells together so they form a clot.  A blood clot can vary in size from pinhead-sized to quarter-sized or larger, a fresh one often appears jelly-like in consistency.\nClots can form in the blood vessels where they aren't supposed to be, usually because the vessels are narrowed by cholesterol buildup or because of insufficient inactivity to keep the blood flowing properly.  These cause heart attacks, strokes, and other health emergencies.
801058
Nucleated red cells in an adult human are very immature forms that can be released into the blood stream at time of stress like severe anemia. \nNucleated red cells are NORMAL in the unborn or recently born.\nTotal leukocyte count refers to the number of White Blood Cells usually reported in thousands per cubic millimeter. If the number is elevated (like 30-50 thousand) in the presence of nucleated red cells can be a sign of Leukemia, a cancer of the blood forming cells.
713031
Red cells that group together normally tend to do so in rouleaux; those that stay as individuals will have greater opportunities to absorb oxygen.  If they pass through capillaries individually will be more efficient as transporters of oxygen.
957391
You can think of blood made from two basic components. First are the cellular components or the red and white blood cells. They are made in the bone marrow and some white cells in the lymph nodes. The watery part is the blood plasma and contains all the hormones, the water, the sugars, dissolved blood gasses, plasma proteins made in the bone marrow and liver and a host of other substances.