Which description matches the role of the RBC membrane being composed of proteins and lipids?

Which description matches the role of the RBC membrane being composed of proteins and lipids?

• A. Regulates gene expression
• B. Stores calcium
• C. Provides deformability and stability
• D. Produces antibodies

Answer: (C)

Membrane composition of proteins and lipids gives red blood cells the ability to deform and stay intact under stress. The lipid bilayer provides fluidity, while a structural protein mesh beneath it—spectrin linked to ankyrin and actin—stabilizes the membrane and preserves the characteristic biconcave shape. This combination lets RBCs bend as they pass through narrow capillaries without rupturing. If this balance is disrupted, RBCs lose deformability or become fragile, leading to anemia. Mature RBCs lack a nucleus, so regulating gene expression isn’t a function of the membrane, and producing antibodies or storing calcium aren’t roles of this membrane.

Membrane composition of proteins and lipids gives red blood cells the ability to deform and stay intact under stress. The lipid bilayer provides fluidity, while a structural protein mesh beneath it—spectrin linked to ankyrin and actin—stabilizes the membrane and preserves the characteristic biconcave shape. This combination lets RBCs bend as they pass through narrow capillaries without rupturing. If this balance is disrupted, RBCs lose deformability or become fragile, leading to anemia. Mature RBCs lack a nucleus, so regulating gene expression isn’t a function of the membrane, and producing antibodies or storing calcium aren’t roles of this membrane.