Autophagy The process by which worn-out cell organelles are enclosed in vacuoles, then broken down by hydrolytic enzymes secreted into vacuole, the breakdown products being reabsorbed afterward.

• 自体吞噬：老化或废弃的细胞产生自体吞噬泡，然后与溶酶体融合进行消化降解的过程。溶酶体产生的水解酶分解已经老化的细胞。