megakaryocyte
Definition
Noun: A very large cell found in bone marrow that is responsible for producing platelets (thrombocytes), which are essential for blood clotting. It is characterized by a large, multilobed nucleus.
Usage
The term is used specifically in the fields of biology, medicine, and hematology to describe this precursor cell. * The megakaryocyte undergoes a unique process called endomitosis, where it replicates its DNA without dividing, becoming polyploid. * Under a microscope, a megakaryocyte is easily identifiable by its size, which is much larger than other bone marrow cells. * Platelets are formed when the cytoplasm of the megakaryocyte fragments.
Advanced Usage
- Megakaryocyte progenitor: Refers to an earlier, less mature cell that will develop into a megakaryocyte.
- Megakaryocyte maturation: Describes the developmental process this cell undergoes before it can produce platelets.
- Dysplastic megakaryocyte: A pathological term for an abnormally developed or misshapen megakaryocyte, often seen in certain blood disorders like myelodysplastic syndromes.
Variants and Related Words
- Megakaryocytic (adjective): Pertaining to or derived from megakaryocytes.
- Example: The biopsy showed increased megakaryocytic activity.
- Megakaryopoiesis (noun): The process of megakaryocyte production and development within the bone marrow.
Synonyms
- Platelet precursor cell (descriptive synonym)
- Thrombocytopoietic cell (technical synonym)
Related Terms (Contextual)
- Platelet (Thrombocyte): The cell fragment produced by the megakaryocyte.
- Bone Marrow: The tissue where megakaryocytes are located.
- Hematopoiesis: The overall process of blood cell formation, which includes megakaryopoiesis.
Noun
-
a large bone marrow cell; regarded as the source of blood platelets
