Monocytes are a type of agranulocytes,
which are in turn a type of leucocytes (white
Agranulocytes (including monocytes) are distinguished from the
other category of leucocytes (called
because agranulocytes do not contain chemical-filled
cytoplasmic vesicles called "granules".
3-8% of all white
blood cells are monocytes.
Monocytes are typically 12-20 um in diameter.
They have kidney-shaped
nuclei and blue-grey cytoplasm which looks somewhat "foamy".
An important function of monocytes is
combatting microbes by the process of phagocytosis (after
transforming into fixed or wandering macrophages).
is the engulfment and digestion of bacteria and other
antigens by phagocytes, as illustrated:
For more information about other components (or "constituents") of
blood, see the page about:
and Functions of Blood.
This may interest students of massage, reflexology, beauty therapies, or other
health or clinical courses.