Erythrocytes, cell of not?

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Waters2
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Post by Waters2 » Fri Jul 15, 2005 11:50 pm

Ok, when the RBC produced, they have nucleus and consider to be a cells. And when they mature, the RBC will be release the nucleus and other organelles to increasing the efficiency of the transport of oxygen. Then, it will be consider or not to be cells? They just live for a 120 days and other cells live more.
chemistry_freako,
What the actual shape when the RBCs still have a nucleus?

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victor
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Post by victor » Sat Jul 16, 2005 12:39 pm

But, some bio books still mention 'cell' word after 'red blood' words. They only lives for 120 days because they're unable to reproduce anymore...
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Post by Dr.Stein » Sat Jul 16, 2005 1:48 pm

IMO, RBC is still a cell and a cell.

My reason is though they lack their nucleus but in the development they have it. And the lost of the nucleus is a "decision", means that they are programmed to degenerate because the cell does not need it anymore, and they also need more space to keep oxygene that is vital for all living body cells.

The other reason is that only human RBC that do not have nucleus. Other vertebrates have RBC with nucleus.

Different to platelets, they are not cells because they just come from debris from megakaryocytes, so they do not possess nucleus. But, frogs' platelets (and other animals) have nucleus, that's why their name is thrombocytes. Many of us, especially in my country, call human platelets as thrombocytes. Actually this is not properly but... well.. everyone calls it so...
Well, at least now people who do not know about this yet knows the history ;)
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Post by MrMistery » Sat Jul 16, 2005 7:11 pm

Dr.Stein wrote:The other reason is that only human RBC that do not have nucleus. Other vertebrates have RBC with nucleus.

mamals don't have nuclei. Every other vertebrate has.

Dr.Stein wrote:But, frogs' platelets (and other animals) have nucleus, that's why their name is thrombocytes.

I read somewhere that amphibian platelets have nuclei but they can break into pieces that do not have one that continue to function
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Post by Waters2 » Sun Jul 17, 2005 12:48 am

So RBC before and after also considered as a cell, then it should be very special for us, no nuclei in our RBC after.
And one things, VIctor said
They only lives for 120 days because they're unable to reproduce anymore...then cell should be divide they ownselves by mitosis but the RBC produce in the bone morrow abd sternum. Are they going for the mitosis process? :?

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Post by Dr.Stein » Sun Jul 17, 2005 3:24 am

MrMistery wrote:mamals don't have nuclei. Every other vertebrate has.

Darn. Sorry, I am too much into Immunology, we talk all about human and forgot the mammal thingy. Yes, you are correct, that's what I mean. Mammal, mammal, mammal. Thank you. :wink:

Waters2:
Erythrocytes do not undergo mitosis because they do not have nucleus that contain chromosomes. Senescent erythocytes will be processed in the spleen, while new erythrocytes will be produced in the bone marrow thru erythopoeisis.
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Post by MrMistery » Sun Jul 17, 2005 8:52 pm

They live 120 days, because, without DNA they are unable to produce proteins to replaced damaged structures anymore
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victor
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Post by victor » Mon Jul 18, 2005 11:43 am

I think 'old' structures are more proper in that sentence.. :lol:
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Post by Dr.Stein » Mon Jul 18, 2005 1:08 pm

or "senescent" will be okay as well :)
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Post by Poison » Mon Jul 18, 2005 3:39 pm

Welcome to English Lessons!!!!
by victor and Dr.Stein. ;)
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Post by MrMistery » Mon Jul 18, 2005 7:56 pm

Teacher, how do you correctly spell hemoglobine?
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Post by Dr.Stein » Tue Jul 19, 2005 1:35 am

The correct one is haemoglobin. Haema = blood + Globin = carrier protein
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