All of the following cell types undergo cell division, EXCEPT:
**Core Concept**
Red blood cells (RBCs) are terminally differentiated cells that do not undergo cell division in humans, unlike most other cell types. RBCs are produced through erythropoiesis in the bone marrow, but once mature, they do not divide or proliferate.
**Why the Correct Answer is Right**
Red blood cells lose their nucleus and most organelles during maturation, which is a unique feature of these cells. This process is essential for the cells to become more flexible and efficient in transporting oxygen. As a result, RBCs cannot undergo cell division, which is a fundamental process that requires a nucleus and a complete set of organelles.
**Why Each Wrong Option is Incorrect**
* **Option A:** Platelets, also known as thrombocytes, do not undergo cell division either, but this is because they are derived from megakaryocytes through fragmentation, not because they are terminally differentiated.
* **Option B:** Lymphocytes, including T cells and B cells, are a type of white blood cell that undergoes cell division to proliferate and differentiate into various subsets.
* **Option C:** Stem cells, including hematopoietic stem cells, are capable of undergoing cell division to differentiate into various cell types, including RBCs.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that RBCs are the only cell type in the human body that does not undergo cell division after maturation. This unique characteristic is crucial for understanding various hematological disorders and the pathophysiology of conditions like polycythemia vera.
**Correct Answer:** A. Platelets.