It is important for the cell to maintain a high surface area: volume ratio so that the gaseous exchange and movement of nutrients and waste material occurs efficiently across the cell membrane. Should the cell expand, then the volume would increase, decreasing the surface area: volume ratio. This would decrease the rate of movement of nutrients and waste material across the cell membrane, also the energy demand of the cell would be higher compared to a smaller cell.
a. Approximately half of those with anorexia nervosa go on to develop bulimia nervosa, indicating that the two disorders may not be distinct but may represent phases of the same eating disorder.
