Question

red blood cells are able to transport oxygen because of their____and because they contain____, which is a protein that binds to oxygen molecules. bicave shape; hemoglobin bicave shape; myoglobin spherical shape; myoglobin spherical shape; hemoglobin concave shape; myoglobin hematin concave shape; hemoglobin hemocyanin hemerythrin

Explanation:

Red blood cells have a biconcave shape which increases their surface - area - to - volume ratio, facilitating gas exchange. Hemoglobin is the protein in red blood cells that binds to oxygen. Myoglobin is mainly in muscle cells, not red blood cells. Spherical or concave (not biconcave) shapes are incorrect for red blood cells in terms of optimal oxygen transport. Hematin, hemocyanin, and hemerythrin are not the relevant oxygen - binding proteins in human red blood cells.

Answer:

A. biconcave shape; hemoglobin