上泽克通大学 Shanghai Jiao Tong University Significance of being small (1): metabolism Nutrients and waste products pass more readily into and out of a small cell,thus accelerating cellular metabolism and growth.营养物和代谢 废物更易进出小型细胞，从而加速代谢和生长 Reason:surface-to-volume (S/)ratio Shanghal Jlao Tona UniversttyShanghai Jiao Tong University Significance of being small (1): metabolism Nutrients and waste products pass more readily into and out of a small cell, thus accelerating cellular metabolism and growth. 营养物和代谢 废物更易进出小型细胞,从而加速代谢和生长. • Reason: surface-to-volume (S/V) ratio