15.Why human beings do not have nucleus in their red blood cells while the 1 point
camel have nucleus in its red blood cells?
a. When first formed in bone marrow, all mammals have a nucleus and other cell
organelles in their RBCs. These are ejected upon maturity in all mammals making
O more space for oxygen transporting haemoglobin. While the camel have oval shaped
RBCs which are circular and enucleated. The oval shape helps to facilitate their flow
in a dehydrated state.
b. Human beings not have nucleus in its RBCs for transport of oxygen While camel
has nucleated RBCs for various functions such as during dehydration,energy
production etc.
Answers
Answer:
Only RBCs don't have nucleus. All other types of blood cells have nucleus.
The nucleus is actually the control center of a cell. It has DNA in it which is required for reproduction of any cell. However, the function of RBCs is very simple. They just carry chemicals around. A RBC has haemoglobin in it which carries oxygen. The RBCs don't need to reproduce as simply more RBCs can be produced by the red bone marrow in a process called erythropoesis.
Also, they don't need any energy for transport as they're carried by the arteries and veins.
Besides, nucleus takes up a lot of space in a cell. And since RBCs don't actually do any of the functions which are nucleus's responsibility, evolution figured it out that it's more logical to just exclude them from the RBCs.
This space can be used to fit in more haemoglobin.
Hence, to carry oxygen more efficiently, RBCs don't have a nucleus.
Note: camels have nucleated RBCs.
Edit: As suggested by User, adding few more details.
When the RBCs are developing in the red bone marrow, they do have nuclei. However, these nuclei are ejected from the cells when they enter the blood stream in a process known as enucleation. This process is exclusive only to mammals as all other animals do have nuclei in their RBCs.
However, the mechanism of enucleation is not yet fully known. A few researchers in 2008 modeled this process. Here is a link to a news article describing the same
Explanation:
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