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nobody would believe me......


or do they have a nucleus??....

a reliable source please......
(T_T)..

and why...

2007-02-06 01:48:43 · 4 answers · asked by darkael08 3 in Science & Mathematics Biology

4 answers

mature red blood cells don't have a nucleus, check these sites out.

http://en.wikipedia.org/wiki/Blood

http://newenglandblood.org/helping/redcells.htm

2007-02-06 01:54:36 · answer #1 · answered by Anonymous · 0 0

Mammals have mature red blood cells without nuclei. Reptiles and birds have nucleated red cells.
Red blood cells have simple functions, that is, to carry oxygen around the blood. They have to sqeeze through very small capillaries to do so. A nucleus would limit the flexibility a bit. Also, the nucleus would require more energy. It is more efficient to just use a nucleus-free red blood cell, and replace it after 120 days or so.
Immature red blood cells in mammals have nuclei while they are still in the marrow, but this is ejected, generally well before it reaches the circulation. In babies, particularly premature babies, there are still a few nucleated red cells in the circulation. If there is a sudden blood loss, this can trigger a response from the bone marrow to produce red cells, and some immature ones escape into the circulation. Some conditions also have circulating nucleated red cells. Thalassemia major, some leukemias, severe burns, among others.

2007-02-06 11:19:45 · answer #2 · answered by Labsci 7 · 0 0

the best source would be a small microscope. Try wikipedia.

They are "daughter" cells from parent cells which like all cells do have a nucleus. (white blood cells also have a nucleus, only redones do not)

When red cells do have a nucleus it is becaus you have a condition known as leukemiea or multiple myloma, in wich the daughter cells can reproduce on thier own, which is very bad and fatal.

2007-02-06 09:54:44 · answer #3 · answered by Anonymous · 0 0

Hmm..it seems they start out with nuclei but then lose it. Here's a link to the Columbia Encyclopedia entry on blood.

2007-02-06 09:56:10 · answer #4 · answered by Mad Tinkerer 2 · 1 0

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