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They did have a nucleus . When they are formed in the bone-marrow, they contain a nucleus, but when the become mature it is replaced by haemoglobin in order to carry more oxygen.
By- Pranjal Prasoon
Wiki User
∙ 13y ago
Wiki User
∙ 14y agothey don't need it. RBC are made in bone marrow and destroyed in the spleen; they pick up and drop off gases based on oncotic pressures and concentration gradients. No control or maintenance tasks are done by the cell because that would require them to use the oxygen they carry there by defeating their purpose.
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∙ 10y agoRed blood cells, white blood cells, and platelets are formed from the same pluripotent stem cells. The stem cells contain all the important parts to form the cell including a nucleus, but is undifferentiated (it does not have a specific job) and is uncommitted (it is not going to do anything specific). At this point it has the potential to become any one of the three types of blood cells. If it is to become a red blood cell, the stem cell goes through many steps in a complex series of protein and hormone interaction to become a committed proerythroblast. From here, it develops into a normoblast; the nucleus begins to shrink and most intercellular structures are reabsorbed by the cell. The last immature form the red blood cells are called reticulocytes; they contain a small nucleus and a mesh network of ribosomal RNA to maintain their now biconcave structure. Hemoglobin synthesis begins in the reticulocyes one day before they leave the bone marrow (where pluipotent stem cells are made and differentiated) and enters the blood stream. The cell will mature in a few days, at the point of maturation the nucleus is released in order to make room for the now fully functional hemoglobin molecule and so the cell finally becomes a mature erythrosite, or red blood cell.
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∙ 15y agoNo, not in humans. Other warm blooded creatures, birds for instance, have nucleated blood cells, but humans do not.
Wiki User
∙ 15y agoDepends on which species you've obtained blood from. In most mammals, no. In birds and reptiles, yes.
Wiki User
∙ 12y agoNo they don't. When red blood cells mature, they lose their nucleus completely in order to make more space for carrying oxygen.
Wiki User
∙ 13y agoRed blood cells do not contain a nucleus.
Wiki User
∙ 11y agoNo they do not have a nucleus
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Are there cells in the human body that lack nuclei if so which?
Red blood cells (erythrocytes) do not have nuclei.
Donut-shaped cells without nuclei are called?
erythrocytes
What is the difference between bird and mammal blood?
Thenoticeabledifference is that bird erythrocytes have organelles and a nuclei, which most mammals erythrocytes don't have.
Does bears cells have a nucleus?
Virtually all eukaryotic (meaning all plants, animals, funghi, etc) cells have nuclei. The only exception of which I can think are erythrocytes (red blood cells) which lose their nuclei as they mature in mammals.
Do mature erythrocytes contain hemoglobin in their cytoplasm?
Yes, mature erythrocytes are still cells and are still living. In most mammals the circulating red blood cells do not have nuclei, so they are unable to repair themselves when damaged and eventually die due to the accumulated damage.
What human cells have no chromosomes?
Some cells like erythrocytes (red blood cells) and thrombocytes (platelets) don't have DNA because they are made from precurors. Erythrocytes are made a process called erythropoiesis and thrombocytes are made by megakaryocytes.
Consider the number of the different cells in blood. which are there more of erythrocytes or leukocytes?
erythrocytes Erythrocytes
What are resealed erythrocytes?
resealed erythrocytes is a targeted system in which drug is loaded in own's erythrocytes for controlled drug delivery
Can mature erythrocytes reproduce?
No. Erythrocytes are produced by bone marrow.
Red blood cells have nuleous?
Assuming that the question asked whether or not a red blood cell has a nucleus, the answer is no. Erythrocytes have no nuclei to create more space for the containment of haemoglobin, the red pigment that is responsible for the uptake of oxygen.
What are the organelles of Reticuloctyes?
Reticulocytes are the second last stage in the formation of erythrocytes ( red blood corpuscles ) 5.5-8.5 microns in diameter. The late normoblasts in the red bone marrow pass into the bloodstream, lose their nuclei just after entering the blood, become erythrocytes (red blood corpuscles) which are 4.2- 6.4 microns in diameter. They are called corpuscles because they lack a nucleus.
What percentage of the body's iron is in erythrocytes?
65% of the body's iron is found in erythrocytes
