Red blood cells are disc-shaped cells with no nucleus. They are very small but their flattened shape gives a relatively large surface area which allows rapid diffusion of oxygen.

Red blood cells are disc-shaped cells with no nucleus. They are very small but their flattened shape gives a relatively large surface area which allows rapid diffusion of oxygen.

Plant cells also contain large vacuoles and chloroplasts. Each organelle performs a specific function critical to the cell's survival (Table 1). Table 1. The structure and function of key eukaryotic ...