Question

Life span of RBC in a newborn is
(A)100 days
(B)120 days
(C)50 days
(D)140 days

Answer 1

Hint: Life span is the period between birth and death. The lifespan of an RBC in a newborn is twenty to fifty days less than the lifespan of an RBC in an adult. they are responsible for carrying oxygen in the body.

Complete answer:
The life span of RBC in the newborn is usually seen between sixty to a hundred days. The fact is that the number of RBCs in a newborn is more than the normal range in the newborn, many RBCs travel from the umbilical cord to the infant and even a baby can get extra RBCs from its twin if present.

Additional Information: Red blood cells (RBCs), are also known as red blood corpuscles, haematodes, erythroid cells, or erythrocytes. The main role of red blood cells is in transporting oxygen to the body tissues through the blood flow via the circulatory system. In the lungs of gills of fish, the red blood cells absorb oxygen and then through blood capillaries release it into tissues. In the cytoplasm of red blood cells is hemoglobin, which is an iron-containing biomolecule present that can bind oxygen and is responsible for the red color of the red blood cells and the blood of humans. A single human red blood cell contains approximately 280 million hemoglobin molecules. The cell membrane of RBCs is composed of basic biomolecules which are proteins and lipids, and this structure provides properties essential for physiological cell function such as deformability and stability.

So, the correct answer is ‘100 days’.

Note: On average,2.4 million new erythrocytes are produced per second in human adults. The red blood is synthesized inside the bone marrow and for about 100–120 days they circulate in the body then they get recycled through macrophages as their components become dead.