Question

what is the advantage of a mature red blood cell having a flattened shape rather than a spherical shape? their surface area to volume will decrease, making it easier for them to fit through arteries and veins. provides more membrane for the electron transport chains where oxygen is consumed. provides more sites for the membrane - bound hemoglobin molecules which transport oxygen. saves energy by making more membrane relative to the volume of the cell. maximizes the relative surface area to exchange gasses.

Explanation:

• A flattened (biconcave) red blood cell increases surface area relative to volume, which boosts gas exchange efficiency.
• The first option is wrong because surface area to volume ratio increases, not decreases.
• Mature red blood cells have no mitochondria, so the electron transport chain option is invalid.
• Hemoglobin is not membrane-bound, so that option is incorrect.
• The shape does not save energy by increasing membrane relative to volume; its key benefit is gas exchange.

Answer:

Maximizes the relative surface area to exchange gasses.