Final answer:
It is true that there is a large reservoir of neutrophils located in the bone marrow. Neutrophils are produced in the red bone marrow and are an essential part of the innate immune system as phagocytic cells, which are derived from myeloid stem cells.
Step-by-step explanation:
The question regarding whether there is a large reservoir of neutrophils located in the bone marrow is true. Neutrophils, along with other types of leukocytes (white blood cells), are produced and stored in the red bone marrow. Specifically, Figure 18.14 in the material describes red bone marrow as the site of production and differentiation for many of the formed elements of blood, which includes erythrocytes (red blood cells), leukocytes (white blood cells), and platelets.
Neutrophils are the most abundant type of granulocytes and play a critical role in the innate immune system as phagocytic cells. They respond quickly to infections by engulfing and destroying pathogens. Neutrophils are part of a group of leukocytes that arise from myeloid stem cells, and they are crucial for fighting off infections and for the overall function of the immune system.
Hematopoiesis, the process through which all blood cells are formed, notably occurs in the bone marrow. Therefore, it's accurate to say that a significant reserve of neutrophils is maintained within the bone marrow, ready to be deployed when the body detects an infection.