50% of platelets are produced in the lung
Who knew? Not me, until this morning. The Lung Is a Site of Platelet Biogenesis and a Reservoir for Haematopoietic Progenitors [2017] - https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5663284/ "The contribution of the lungs to platelet biogenesis is substantial, accounting for approximately 50% of total platelet production or 10 million platelets per hour." In the lungs. 10 million an hour - holy moly. This is like when I found out about physiological hematopoietic stem cell migration. Or B cells cranking out between ten and a hundred thousand anitbodies per second: https://youtu.be/J9jcnh3E0Fw