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While organs are generally considered to have a single, specified function (or perhaps a group of closely-related functions), blood (the fluid inside the vessels, not the vessels themselves) has many different functions: deliver $O_2$ from lungs to cells remove waste $CO_2$ from cells to lungs respond to injury by clotting carry multiple different types of ...


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Blood is considered a type of connective tissue (sometimes). However, an organ is formed of multiple different tissues. Thus, blood is a tissue, not an organ.


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In comments it been discussed that clotting is partial answer to OP. I would say, that is is somewhat tangential to the original question. If I may re-phrase, OP asks: how one can estimate age of blood that has been exposed to air? Problem is that you will have to have a starting point to solve that backwards, like having an initial condition for solving ...


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I found a nice article that has insights to this matter. As posted before me it is true that only adults, but not juvenile individuals show this difference. Direct and indirect effects of sex hormones on bone marrow erythropoiesis and renal erythropoietin production has been proven, but it works in both sexes the same way. Females are capable to elevate ...


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Leukopenia is just a definition. In medicine, there's a saying: Treat the patient, not the numbers. Numbers can mislead people, sometimes quite seriously. Definitions of leukopenia vary: some define it as less than 5,000 WBCs per ┬ÁL of blood; others define it as less than 4,000. Decreases in specific WBCs is usually described as neutropenia, ...


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I know WBC is primarily responsible for fighting infectious micro-organisms, but does it have any significant role in cleaning up body's own malfunctioning or ageing cells? They kill the pathogens, infected, senescent, mutated or unnecessary cells, clean up the cell fragments, clean up the oxidized LDL from the surface or arteries, etc... So I think ...


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The most common IV drip that would be sent home with a pet owner is Ringer's solution. This fluid is also commonly injected as a subcutaneous (between muscle and skin) bolus into both cats and dogs. Although IV administration is more efficient, this fluid is completely harmless if an IV catheter were dislodged allowing it to accumulate in the surrounding ...


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found on internet: After blood donation, it generally takes a day or two to replenish the fluid volume in the body and three months for the regeneration of red cells to donate more blood. The total amount of blood circulating in our body's cardiovascular system is about 5 liters. Of this amount, only about 350 ml. is bled from the body during blood ...


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My answer below directly (and solely) addresses what I think is the main gist of the question: Are there any adverse effects on one's physiology as a direct result of donating blood? Blood donation, at the amounts typically taken (200~500mls), will not harm you. A healthy human being produces approximately 100,000,000,000 (one hundred billion) NEW ...



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