Overview

The hematologic system comprises blood cells plasma and bone marrow responsible for oxygen transport immunity and coagulation. Bone marrow produces erythrocytes leukocytes and platelets through hematopoiesis. Blood components deliver nutrients remove waste and mediate immune responses.

Blood Cell Lineages

Erythrocytes transport oxygen via hemoglobin and maintain acid base balance. Leukocytes provide innate and adaptive immune defense and platelets mediate hemostasis. Dysregulation leads to anemia infection bleeding or thrombosis.

Bone Marrow Function

Marrow contains hematopoietic stem cells and stromal support for blood cell production. Marrow cellularity and composition change with age disease and therapy. Imaging and biopsy assess marrow disorders and malignancies.

Clinical Relevance

Hematologic diseases include leukemia lymphoma anemia and coagulopathies. Laboratory testing imaging and bone marrow biopsy guide diagnosis and treatment. Transfusion and targeted therapies address functional deficits.