2007-10-16 13:23:11 · 10 answers · asked by Anonymous in Science & Mathematics ➔ Medicine
Immature RBC's have a nucleus. As the cell matures the nucleus moves towards the edge of the cell membrane and is expelled. Under normal conditions, nucleated RBC's are seen in newborns. In children and adults it's a indicator of a pathological condition.
2007-10-16 14:46:15 · answer #1 · answered by Phu Bai 2 · 0⤊ 0⤋
Red blood cells aren't truly cells. A true eukaryotic cell contains a nucleus (and other organelles) which allows the cell to reproduce and carry out a multitude of vital functions.
A red blood "cell" is an off-spin, if you will, from cells in your bone marrow. Keep in mind that an RBC only has hemoglobin protein inside of it. When cells excrete proteins, they often times do so in vesicles. The protein is inside the vesicle, and the vesicle is derived from the original cell membrane or the membrane of the golgi apparatus.
Therefore, an RBC has a "cell" membrane derived from a bone-marrow cell, with a hemoglobin protein inside. The hemoglobin protein was created from the DNA in the bone-marrow cell nucleus.
2007-10-16 13:42:59 · answer #2 · answered by zachyaz 3 · 1⤊ 0⤋
As stated by Rh red blood cells do not reproduce. The nucleus contains the building blocks for reproduction.
2007-10-16 13:31:44 · answer #3 · answered by Teacher 6 · 0⤊ 1⤋
Mammalian RBCs have evolved by natural selection to pack in as many hemoglobin molecules as possible. Denucleation means a single RBC can carry much more O2.
As to why other taxa still have their nucleus...that's a more interesting question.
2007-10-16 13:34:06 · answer #4 · answered by yutgoyun 6 · 1⤊ 0⤋
a nucleus contains DNA or RNA which are the storehouse of material required for when the cell replicates either through mitosis or meiosis.
Red blood cells don't replicate or reproduce. They merely live die and get recycled by the liver.
2007-10-16 13:33:23 · answer #5 · answered by greybeads 3 · 0⤊ 1⤋
Erythrocytes (RBC's) & several white blood cell (WBC or leukocyte) types are derived from common "hematopoietic stem cells" (hemocytoblasts) in the bone marrow. These "pluripotential" stem cells (hemocytoblasts) later modify into nucleated WBC and anuclear RBC .
2007-10-16 21:14:02 · answer #6 · answered by J.SWAMY I ఇ జ స్వామి 7 · 0⤊ 0⤋
zachyaz is correct
red blood cells are technically not a cell, but are a fragment of their erythrocyte mother cells.
The erythrocytes "cut loose" of the red blood cells to perform clotting.
2007-10-16 18:05:44 · answer #7 · answered by Anonymous · 1⤊ 0⤋
The other answerer was correct--but buried in the other answers--they lose their nuclei so that they can pack in the hemoglobin to carry as much oxygen to the cells as possible.
2007-10-16 16:22:10 · answer #8 · answered by Diane A 7 · 1⤊ 0⤋
They don't need one, as they do not reproduce. Nature doesn't tend to spend resources on unnecessary features.
2007-10-16 13:27:24 · answer #9 · answered by Anonymous · 0⤊ 2⤋
i dnt kno...i learned this in 5th grade and i still dont get it -_-
2007-10-16 13:25:50 · answer #10 · answered by pd5119 5 · 0⤊ 2⤋