Question

Erythropoiesis starts in
A. Kidney
B. Liver
C. Spleen
D. Red bone marrow

Answer 1

Erythropoiesis comes from the Greek word Erythro' which means red and 'poiesis' signifying 'to make'.It is a cycle that produces red platelets. It is invigorated by diminished oxygen available for use, and is identified by the kidneys., which at that point discharge hormone ' erythropoietin'.

Complete answer:
This hormone animates the red platelet antecedents., which then activates the creation of red platelets in hemopoietic tissues, and this typically happens in the bone marrow.
Erythropoiesis is the cycle which produces red platelets (erythrocytes), which is the advancement from erythropoietic immature microorganisms to develop red blood cells.

Additional Information:
It is animated by diminished $O_2$ available for use, which is distinguished by the kidneys, which at that point emit the hormone erythropoietin. This hormone invigorates the expansion and separation of red cell antecedents, which enacts expanded erythropoiesis in the hemopoietic tissues, eventually creating red platelets (erythrocytes). In postnatal fowls and warm-blooded creatures (counting people), this typically happens inside the red bone marrow. In the early embryo, erythropoiesis happens in the mesodermal cells of the yolk sac. By the third or fourth month, erythropoiesis moves to the liver. After seven months, erythropoiesis happens in the bone marrow. An expanded degree of actual action can cause an expansion in erythropoiesis. However, in people with specific infections and in certain creatures, erythropoiesis additionally happens outside the bone marrow, inside the spleen or liver. This is named extramedullary erythropoiesis.

So, the correct answer is ‘Red bone marrow’.

Note: The bone marrow of basically all the bones produces red platelets until an individual is around five years of age. The tibia and femur stop to be significant locales of hematopoiesis by about age 25; the vertebrae, sternum, pelvis and ribs, and cranial bones keep on delivering red platelets all through life. Up to the age of 20 years, RBCs are delivered from the red bone marrow of the apparent multitude of bones (long bones and all the level bones). After the age of 20 years, RBCs are delivered from membranous bones, for example, vertebrae, the sternum, ribs, scapulas, and the iliac bones. Following 20 years old, the pole of the long bones becomes yellow bone marrow in view of fat testimony and loses the erythropoietic capacity.