Final answer:
It is false that both granulocytes and agranulocytes arise from the lymphoid stem cell line. Granulocytes arise from myeloid stem cells, while only lymphocytes, a type of agranulocyte, arise from lymphoid stem cells.
Step-by-step explanation:
The statement that both granulocytes and agranulocytes arise from the lymphoid stem cell line is False. Granulocytes and agranulocytes are two categories of leukocytes, or white blood cells, found in the blood. Granulocytes, as the name implies, contain granules in their cytoplasm and include neutrophils, eosinophils, and basophils. These cells are produced from myeloid stem cells.
In contrast, agranulocytes have smaller or less visible granules in their cytoplasm. This category encompasses lymphocytes and monocytes, which include T cells, B cells, and natural killer cells. Of these, only lymphocytes arise from the lymphoid stem cell line, with B cells maturing in the bone marrow and T cells maturing in the thymus. Monocytes, which mature into macrophages, also arise from myeloid stem cells, not lymphoid stem cells.