What is the hematopoietic system?

The haematopoietic system is the system of organs and tissues, including the bone marrow, spleen, thymus and lymph nodes, involved in the production of cellular blood components.

What body system does hematopoiesis occur?

Hematopoiesis is the production of all of the cellular components of blood and blood plasma. It occurs within the hematopoietic system, which includes organs and tissues such as the bone marrow, liver, and spleen. Simply, hematopoiesis is the process through which the body manufactures blood cells.

What is the primary hematopoietic tissue in the body?

Introduction. The hematopoietic and lymphoid tissues give rise to and house erythrocytes (red blood cells), leukocytes (white blood cells), and platelets. The hematopoietic tissues arise from hematopoietic stem cells (HSCs) (Fig. 19.1), and include bone marrow, peripheral blood, and certain lymphoid tissue.

How does hematopoiesis support the body?

Hematopoietic stem cells that are found in red bone marrow can develop into a variety of different blood cells, including: Red blood cells. These are the cells that work to carry oxygen-rich blood to the cells of the body.

What is the main function of the hematopoietic system?

The hematopoietic system provides for the regulated production of the complete complement of mature blood cells in the peripheral circulation, which includes neutrophils, eosinophils, basophils, monocytes, lymphocytes megakaryocytes (platelets), and erythrocytes.

What is hematopoietic vitamin?

Several vitamins play important roles in hematopoietic system. Vitamin B12, C and folic acid are associated with DNA synthesis of erythroid nucleus, the deficiency of which causes the megaloblastic anemia. Some megaloblatic anemia and sideroblastic anemia might response to vitamin B1 and B6, respectively.

What causes hematopoiesis?

When red blood cell (RBC) numbers are low, the body induces a homeostatic mechanism aimed to increase the synthesis of RBCs, typically via the production of erythropoietin. If the loss of RBCs becomes severe, hematopoiesis will occur in the extramedullary spaces outside the bone.

Which bones does hematopoiesis occur?

After birth, and during early childhood, hematopoiesis occurs in the red marrow of the bone. With age, hematopoiesis becomes restricted to the skull, sternum, ribs, vertebrae, and pelvis.

What hormone stimulates hematopoiesis?

Parathyroid hormone (PTH) stimulates hematopoietic cells through mechanisms of action that remain elusive. Interleukin-6 (IL-6) is upregulated by PTH and stimulates hematopoiesis.

What hormone is responsible for hematopoiesis?

What is hematopoiesis and where does it occur in adults?

Hematopoiesis: The production of all types of blood cells including formation, development, and differentiation of blood cells. In the normal situation, hematopoiesis in adults occurs in the bone marrow and lymphatic tissues.

How is hematopoiesis related to immune system?

Hematopoietic stem cells (HSCs) differentiate and generate all blood cell lineages while maintaining self-renewal ability throughout life. Systemic responses to stressful insults, either psychological or physical exert both stimulating and down-regulating effects on these dynamic members of the immune system.