Answer:
The correct answer is a. True
Explanation:
The red blood cells in humans are originated in bone marrow and are called erythrocytes. It's main function is to carry oxygen to the tissue. It has biconcave shape. It contains a protein named hemoglobin which can bind to oxygen present in the lungs and carry to other organs of the body.
Red blood cells lack nucleus and is produced by a process called erythropoiesis in bone marrow. In this stem cells converts into erythrocytes with in 7 days and released into circulation where it lives about 80-120 days after that they are destroyed in spleen by spleenic macrophages.
