Question

Erythropoietin Stimulates
A. Osmoregulation
B. Formation of RBC
C. Reduces blood pressure
D. Formation of WBC

Answer 1

Hint: Erythropoietin, is a glycoprotein having carbohydrates and polypeptide chains. It is also known as haematopoietin and is secreted by kidneys. Its function is to compensate for the decreasing level of oxygen in tissues.

Complete answer:
Osmoregulation Is a process by which our body regulates the osmotic pressure of electrolytes and fluids in our body. Osmoregulation is regulated by an enzyme called ADH (Antidiuretic Hormone). Since, erythropoietin hormone has got nothing to do with the osmoregulation process therefore it is an incorrect option.
Erythrocytes are commonly known as red blood cells. The process of formation of erythrocytes is called erythropoiesis. In the kidney, juxtaglomerular cells (JG Cells) stimulate production of red blood cells, with the help of an enzyme called erythropoietic or REF (Renal Erythropoietin Factor). This process is called erythropoiesis. At the time of oxygen crisis in any tissue, the hormone ensures adequate oxygen supply by initiating RBC production. So, option B is the correct answer.
Blood pressure is not regulated by any single hormone. However, it can be reduced by different factors such as Cardiac output, heart rate, elasticity in blood vessels, etc. Since it is not reduced by Erythropoietin hormone, option C stands to be an incorrect option.
The human body contains approx 5000 to 10,000 White blood cells per cubic mm. The WBCs are produced inside the spleen, thyroid, lymph nodes and red bone marrow. WBCs are formed from myelocytes (WBC-producing cells) in hematopoietic stem cells of bone marrow and are not regulated by the erythropoietin hormone, Therefore, option D is also an incorrect option.

So, option B, formation of RBC is the correct answer.

Note:
Erythropoietin is a hormone released by JG Cells. These JG cells are also a storehouse of Renin enzymes. Besides, Thyroxine, a hormone secreted by thyroid gland is also supportive of erythropoiesis. It is endogenously produced and circulated in the body's plasma through which it acts on target cells present in bone marrow.