Recently, scientists have found out that bone marrow are not the soloist involved in making blood – lungs are also involved! Not only are lungs responsible for making approximately 50% of the platelet (things that help blood clot), cells in the lungs can move to and repopulate the bone marrow in mice with stem cell deficiency in the bone marrow.
Further reading
http://www.nature.com/nature/journal/vaop/ncurrent/full/nature21706.html
the Runaway Lab Book 