Which of the following is not true of red blood cells?

A) The biconcave disc shape makes them look hollow in their centers.
B) They are also called erythrocytes.
C) They transport oxygen through the blood, but not carbon dioxide.
D) They contain hemoglobin for gas transport.
E) All of these are true of red blood cells.

Erythrocytes

Red blood cells responsible for carrying oxygen from the lungs to the body tissues and carbon dioxide as a waste product away from the tissues back to the lungs.

Biconcave Disc

Describes the shape of red blood cells, which are concave on both sides, allowing for flexibility and increased surface area for gas exchange.