Explain the following in detail

1. How Red Blood Cells develop.

2. How platelets are formed.

3. How T lymphocytes develop

Expert Answers

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1. Red bloods cells start as immature cells within the body's myeloid tissue, which is also known as red bone marrow. A hormone called erythropoietin, which is produced in the kidneys, controls most of the body's red blood cell production. Humans can produce around two million red blood cells per second. These cells have a maturation time of about seven days and a lifespan of about one hundred and twenty days. Hemocytoblasts are a type of stem cell found within the red bone marrow that are an essential component of red blood cell production. When a hemocytoblast commits to becoming a cell called a proerythroblast, it will transform into a red blood cell.

2. Just like red blood cells, platelets are formed inside of bone marrow. The platelet's main function is to prevent the body from bleeding. Cells in the bone marrow called megakaryocytes produce large numbers of platelets and are controlled by a hormone called thrombopoietin, which is produced in the liver and kidneys. Once the production of platelets begins, it takes about seven days for the platelets to join the bloodstream. The average adult human has approximately one trillion platelets circulating within their body at any given time.

3. As with red blood cells and platelets, T lymphocytes develop within the bone marrow from stem cells. Some T cells migrate through the bloodstream to the thymus gland, where they mature. The thymus gland is small organ which is located behind the sternum, between the lungs. T cells serve an important purpose by protecting the body from viruses, bacteria, and parasites.

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