Question

Which of the following statements on the red blood cells in humans is/are true?
a. Are released from the bone marrow as mature red blood cells
b. Do no contain mitochondria
c. Have a lifespan of 120 days in the circulation
d. All of the above

Answer 1

Hint: Red blood cells are also called as red cells, red blood corpuscles, or erythrocytes, this are important components of the blood and the function of RBC is to transport the oxygen to all body parts with the help of hemoglobin present in the red blood cells.

Complete answer:
- Red blood cells are biconcave in shape, which means they are flat at the center and dumbbell shape at the periphery.
- The process of production of red blood cells is called erythropoiesis. In the initial stage of RBC formation, there is the presence of nuclei and all, later when the RBC mature the nucleus disintegrates And it does not have any cell organelles.
- Human blood takes 60 seconds to complete the one circulation.
- When it comes to erythropoietin, which is the production of red blood cells, this is taking place in the bone marrow of the long bones. And it takes only 7 days to produce.
- The life span of the RBC is 120 days and the important function is to carry oxygen to all body parts but due to lack of mitochondria and other cell organelles, RBC does not require oxygen for themselves.

Hence, The correct answer is option (D).

Note: Deficiency of this Red blood cell, decrease the oxygen transport and it may result in so many diseases such as anemia, and this is of again different types and if there any chromosomal abnormality results in abnormal types like in Thalassemia, etc.