Blodpladerne

Blodpladerne, also known as platelets, are tiny, irregular-shaped cell fragments found in the blood of vertebrates. They are crucial components of the circulatory system, playing a vital role in hemostasis, the process of stopping bleeding. When a blood vessel is injured, blodpladerne are activated and aggregate at the site of the wound, forming a plug that seals the damage. They also release various factors that promote blood clotting, further reinforcing the plug and preventing excessive blood loss.

These small cells are produced in the bone marrow from large precursor cells called megakaryocytes. A typical adult has a circulating platelet count ranging from 150,000 to 400,000 per microliter of blood. Their lifespan is relatively short, lasting about 7 to 10 days, after which they are removed from circulation by macrophages, primarily in the spleen and liver.

Disruptions in platelet count or function can lead to significant health issues. Thrombocytopenia, a condition characterized by a low platelet count, can result in increased bleeding. Conversely, thrombocytosis, a high platelet count, can increase the risk of blood clots, potentially leading to strokes or heart attacks. Various medical conditions and medications can affect platelet levels, making their monitoring important for overall health assessment.