Which part of the body is responsible for the manufacture of red blood cells?

Bone marrow

The correct answer is Option (3) - Bone marrow

The part of the body responsible for the manufacture of red blood cells is:Bone marrow

Bone marrow, found within the cavities of bones, is responsible for the production of red blood cells through a process called hematopoiesis. Red blood cells, also known as erythrocytes, are essential for transporting oxygen from the lungs to tissues throughout the body and carrying carbon dioxide back to the lungs for exhalation. The bone marrow contains hematopoietic stem cells, which give rise to all types of blood cells, including red blood cells, white blood cells, and platelets. These stem cells undergo differentiation and maturation into specialized blood cells under the influence of various growth factors and hormones. Therefore, bone marrow plays a critical role in maintaining the body's blood cell population, including the continuous production of red blood cells to replace those that are old or damaged.