In an ablated animal, myeloid series cells are injected. Which of the following is seen after incubation period?
**Core Concept**
The myeloid series cells injected into an ablated animal is a classic experiment to study hematopoiesis and erythropoiesis. The myeloid lineage includes cells responsible for producing various types of blood cells, including erythrocytes, which are essential for oxygen transport. In this context, the ablated animal refers to a host whose bone marrow has been depleted of its hematopoietic cells, making it an ideal recipient for injected myeloid cells.
**Why the Correct Answer is Right**
When myeloid series cells are injected into an ablated animal, these cells will differentiate and proliferate to replace the depleted hematopoietic cells. The injected cells will undergo erythropoiesis, leading to the production of erythrocytes. This process is mediated by the erythropoietin (EPO) pathway, where EPO stimulates the proliferation and differentiation of erythroid progenitor cells. The resulting erythrocytes will be produced in large numbers, leading to an increase in red blood cell mass.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not accurately describe the outcome of injecting myeloid series cells into an ablated animal. While the injected cells may contribute to the production of other types of blood cells, the primary effect is the production of erythrocytes.
**Option B:** This option is incorrect because it suggests that the injected cells will differentiate into lymphocytes, which is not the primary outcome of this experiment. While myeloid cells can give rise to lymphoid cells under certain conditions, this is not the primary effect in this scenario.
**Option C:** This option is incorrect because it suggests that the injected cells will not contribute to the production of erythrocytes. This is not accurate, as the myeloid series cells injected into an ablated animal will undergo erythropoiesis and produce large numbers of erythrocytes.
**Option D:** This option is incorrect because it suggests that the injected cells will only produce platelets. While myeloid cells can give rise to megakaryocytes, which produce platelets, this is not the primary outcome of this experiment.
**Clinical Pearl / High-Yield Fact**
The EPO pathway plays a crucial role in regulating erythropoiesis, and dysregulation of this pathway can lead to anemia or polycythemia. Understanding the role of myeloid series cells in erythropoiesis is essential for diagnosing and managing hematological disorders.
**Correct Answer:** C. Production of erythrocytes.