The White Blood Cells form in the lymphoid organ because the lymph system is not a closed system and contains a fluid called the lymph.
The thymus is the only lymphoid organ that does not directly fight infections. Instead, it is responsible for the development and maturation of T-lymphocytes, crucial for immune response.
Your spleen is a "big 2 gallon bowl of blood" that holds replacable blood if you start to bleed out. It can only last for 15 minutes until you die.
The only leukocyte type to arise from the lymphoid stem cell is the lymphocyte. Lymphocytes consist of B cells, T cells, and natural killer (NK) cells, which are key components of the adaptive and innate immune responses.
Not very much time and it is a very complex process. Your body makes white blood cells (WBCs) at such a high rate that it makes more of them everyday than it does red blood cells (RBCs). And consider that RBCs live about 120 days, as opposed to WBCs that only live for a few minutes, hours, or only days. That is even more amazing when you consider that about 45% of your blood is RBCs and less than 1% is WBCs. I don't have the exact time, but I can surely say this, very fast and very profusely.
the only organ that does not float is the brain
The brain is the only organ controlling your emotion. It is one of the major organ of the body.
Compared to what? It is the only respiratory organ in humans.
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there is no organ in the muscular system, only bones and muscles
The Heart
body
The only organ fully developed at birth in the human body is the brain.