Blood cell lineages | Human anatomy and physiology | Health & Medicine | Khan Academy

All blood cells develop from a single type of cell called a pluripotent cell (also known as a hematopoetic stem cell or a hemocytoblast). Pluripotent cells can give way to different lineages of cells, including lymphocytes or myelocytes. The lymphocyte lineage is composed mainly of T- and B-cells (white blood cells), while the myelocyte lineage includes a variety of immune cells, as well as red blood cells.

Health & Medicine on Khan Academy: No organ quite symbolizes love like the heart. One reason may be that your heart helps you live, by moving ~5 liters (1.3 gallons) of blood through almost 100,000 kilometers (62,000 miles) of blood vessels every single minute! It has to do this all day, everyday, without ever taking a vacation! Now that is true love. Learn about how the heart works, how blood flows through the heart, where the blood goes after it leaves the heart, and what your heart is doing when it makes the sound “Lub Dub.”

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[PraneetPaidisetty]

Yes, I have the same issue, in the beginning you said macrophages exist in the blood, I'm sure they're monocytes instead, whereas macrophages exist in tissues.

[badelight]

Amazing summary. But agree with the reply below u have to say monocyte qt 0:26.. Otherwise that's awesome

[MajorSmall]

0:26 That should be "Monocyte", not "Macrophage"

[brandontran]

Is the Pluripotent hematopoetic stem cell the same as the hemocythoblast?

[gtuda]

Macrophages are actually from the connective tissue, but they come from monocytes.

[mohammadrezaeslami]

Mast cell also comes from mesenchymal stem cells, not hematopoietic stem cells.

[therikkysixx]

i have rock and roll in my blood cells... anyone else have that?

[mohammadrezaeslami]

Macrophages does not exist in the blood.
I think you're wrong.

[badelight]

Amazing summary. But agree with the reply below u have to say monocyte qt 0:26.. Otherwise that's awesome