Certification Board for Sterile Processing and Distribution (CBSPD) Sterile Processing Technician Practice Exam

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In which part of the body do red blood cells develop?

Liver
Lungs
Bone Marrow
Heart

The correct answer is: Bone Marrow

Red blood cells, also known as erythrocytes, primarily develop in the bone marrow, which is the soft, spongy tissue found in the center of certain bones. During the process of hematopoiesis, stem cells in the bone marrow differentiate into various types of blood cells, including red blood cells. This process is essential for maintaining an adequate supply of red blood cells in the bloodstream to transport oxygen from the lungs to tissues and organs throughout the body. The other options—liver, lungs, and heart—do not serve as primary sites for red blood cell production. While the liver has important functions related to blood filtration and metabolism, it is not involved in the formation of red blood cells. The lungs are responsible for gas exchange (oxygen and carbon dioxide), and while they are vital for the oxygenation of blood, they do not produce blood cells. The heart pumps the blood but does not play a role in the development of blood cells. Therefore, the bone marrow is the correct answer as the primary site of red blood cell development.