What is the definition of Graduated Blood Cells?

Graduated blood cells, my friend, are like the ultimate life form in your circulatory system - they start off as tiny, eager newbies called blastocytes, then morph into more sophisticated cells like erythrocytes (red blood cells), then platelets (blood clotting stars), and finally, megakaryocytes (the giant cell factories of the bone marrow). They're basically your body's way of upgrading itself, step by step, in a process as cool as a summer breeze.

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Now, here's an edgy example sentence using that term: "As the graduate blood cells, they decided to take a detour from their original career path and started volunteering at the local graveyard, collecting the 'graduation certificates' for every single deceased soul who'd given their all for a decent education."