ASpleen is the graveyard of RBC
BMature RBC is nucleated
CRBC's are biconcave in shape
DThe average lifespan of RBCs are 120 days
Answer:
B. Mature RBC is nucleated
Read Explanation:
a) Spleen is the graveyard of RBC: This statement is correct. The spleen is the primary organ where old and worn-out red blood cells are filtered out of the blood and broken down.
b) Mature RBC is nucleated: This statement is incorrect. Mature red blood cells (erythrocytes) in mammals, including humans, do not have a nucleus or other organelles like mitochondria. This anucleated state allows the cell to be more flexible and to pack in more hemoglobin, which is essential for oxygen transport.
c) RBC's are biconcave in shape: This statement is correct. The biconcave disc shape provides a large surface area-to-volume ratio, which facilitates the rapid diffusion of oxygen into and out of the cell. It also makes the cells flexible enough to squeeze through narrow capillaries.
d) The average lifespan of RBCs are 120 days: This statement is correct. Red blood cells circulate in the bloodstream for approximately 120 days before they are removed by the spleen and liver.