Red and white blood cells are produced by the _____ system.

Red and white blood cells are produced by the hematopoietic system, which is a part of the larger circulatory system. Specifically, these blood cells originate from specialized tissues in the bone marrow. The process of blood cell production is known as hematopoiesis, and it takes place throughout a person's life, adapting to various needs of the body, such as responding to infections or maintaining adequate oxygen levels.

Additionally, red blood cells (erythrocytes) are responsible for transporting oxygen from the lungs to the rest of the body, while white blood cells (leukocytes) play a critical role in the immune response, helping to defend against pathogens. Thus, the hematopoietic system is essential for maintaining both strength and health within the body.