Erythropoiesis

Erythropoiesis

The making of red blood cellsThe basic structural and functional units of life. is called erythropoiesisThe process of red blood cell production.. It’s a process that’s always going on in your body. Just because you’re making cells doesn’t mean that something’s wrong. When you make white blood cells, you have an infection. Your red blood cells have a 120-day lifespan. They’re meant to do their process for that long and then to be removed. They take a lot of mechanical abrasion. They get squished through capillariesThe smallest blood vessels where gas, nutrient, and waste exchange occurs between blood and tissues.. They bump up against each other and wear out like the soles on your shoes.  After about 120 days, they either pop open or are removed by the spleen.  In order to keep your RBC count in equilibrium, more red blood cells are made.  Where are they made, you ask?  In your red bone marrow.  This is the bone marrow most present in flat bones. It includes bones like your hips, sternumFlat bone forming the center of the chest; anchor for ribs and clavicles. Appears as a vertical dagg, and even your skull bones.  As you age, red marrowBone marrow that produces blood cells. converts to yellow marrow, lowering your ability to replenish red and white blood cells.

What you need

To make red blood cells comes from the breakdown of the other red blood cells. In that way you’re just constantly recycling a lot of the cell membrane components and the hemoglobinThe oxygen-carrying protein in red blood cells that gives blood its red color. that’s contained inside. Your organs are good at recycling. However, there are a few things that you need to continually have in your diet. The two major vitamins that you need to have to make red blood cells are B6 and B12. We will be talking about pernicious anemiaA type of anemia caused by a deficiency of intrinsic factor, leading to poor vitamin B12 absorption. which is a lack of B12. It’s important to realize that a lack of B12 can happen for many reasons. It’s not only because you’re not getting it in your diet.

 Iron is lost through the recycling of bileA digestive fluid produced by the liver and stored in the gallbladder; it helps emulsify fats for di. Therefore, you need to continually consume foods with iron. To obtain iron and the B vitamins, all you need are eggs and fish. If you do not eat eggs and fish, try these wonderful vegetables for what you need. You also need amino acids. However, you are creating amino acids every time you take in protein-rich foods. Your body is capable of making 18 out of the 20 existing amino acids on this earth. If you do not eat other animals you will need to take care to obtain these other two amino acids which can be done by eating wheat bread and hummus period

Cell Lineage

Now, let’s revisit red blood cells. They, along with other formed elementsThe cellular components of blood, including red blood cells, white blood cells, and platelets., originate from hematopoietic stem cells. The stem cells divide into lymphoid stem cells. These cells make lymphocytes. They also divide into myeloid stem cells, which make everything else: neutrophils, eosinophils, basophils, monocytes, megakaryocytes, and red blood cells. Among white blood cells, neutrophils are the most abundant, followed by lymphocytes, monocytes, eosinophils, and basophils. A colony forming unit is just an aggregation of cells with all the same different cell membrane proteinsLarge molecules made of amino acids with various functions in the body.. As red blood cells mature, the composition of protein receptorsProteins located on the surface or inside cells that bind specific molecules (e.g., neurotransmitter and enzymesProteins that speed up chemical reactions in the body. in the cell membrane changes. Mostly when cells are developing it’s the intercellular receptors that are the most important in defining a cell.

Cell Sequence

Colony forming units can also be called committed cells. In erythrocyte production, committed cells are those that have acquired the receptors for the hormone erythropoietin(EPO): A hormone produced by the kidneys that stimulates erythropoiesis., abbreviated as E-P-O. EPO receptors define these cells as cells that will become red blood cells. Other cells arising from the myeloid stem cell do not have these EPO receptors. Once the cell has been committed it can now respond to EPO and does respond to EPO. The cell creates organellestructures within a cell that perform specialized functions. such as a nucleusThe control center of the cell that contains DNA and directs cellular activities. and endoplasmic reticulum and becomes what we call an erythroblast.  There can be a few stages to erythroblast formation.

At first, organelles are used to make the hemoglobin protein. When enough hemoglobin has been accumulated, the erythroblast removes all of its organelles. This process makes room for the hemoglobin. Therefore late erythroblastsImmature red blood cells in bone marrow that develop into erythrocytes. are usually a little bit larger than the other cells in the sequence. Reticulocytes are not fully matured red blood cells but they leave the red bone marrow and enter into circulation. They circulate for about two weeks finally developing the bioconcave shape. At the point when their surface area to volume ratio is greatest for the bioconcave shape, they are considered full erythrocytes(RBCs): Red blood cells responsible for oxygen transport.. At this point, they are considered full erythrocytes.

Erythropoietin

Erythropoietin is an amino acidThe building blocks of proteins, consisting of an amino group, carboxyl group, and side chain. hormone made by the kidney. There are cells in the kidney called granular cellsSpecialized cells in the juxtaglomerular apparatus that secrete renin in response to low blood press and they can be triggered to release erythropoietin in three ways. If the kidney itself receives hypoxic blood, it will respond by releasing EPO. This deprives cells of the nephronThe functional unit of the kidney that filters blood and produces urine. from oxygen. There are chemo sensors in your lung that can detect low oxygen status. These chemoreceptors feed back to the granular cells and can provoke them to release EPO. If your lungs have damaged surfaces and are secreting certain chemicals, like interleukins and cytokines, there are chemoreceptors. These chemoreceptors can communicate with the granular cells of the kidney, triggering it to release EPO.

The target of EPO is specifically to increase the rate at which you make red blood cells. The committed cells in the red bone marrow are the focus. Hematopoietic stem cells do not have EPO receptors. Myeloid stem cells also lack EPO receptors. These two types of cells are incapable of being provoked by EPO to increase red blood cell production. Only erythroblasts and reticulocytes have EPO receptors and are capable of responding to it. As a result of EPO hemoglobin and erythrocyte production speeds up to about 10 times its regular rate. All of the reticulocytes that are currently in circulation will mature to the optimal bio concave shape within days. But the true benefits of EPO will be felt later. This occurs when all the erythroblasts currently in production mature. Their entry into circulation is essential.

At the same time that we’re increasing red blood cell production we also need to increase red blood cell breakdown. The spleen responds to that by creating more macrophages that are capable of breaking down red blood cells. The liverA large organ that produces bile, detoxifies blood, and stores nutrients. processes the iron and the bilirubinA yellow pigment produced from the breakdown of hemoglobin, excess amounts cause jaundice.. Hopefully, most of it is returned to red bone marrow. However, some of the iron and bilirubin will be lost in fecesSolid waste material formed in the large intestine and expelled through the anus..