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| the offspring of a zebra and a donkey. |
| a scrap or morsel of food left at a meal. |
| apoptosis (āp'əp-tō'sĭs, āp'ə-tō'-) Pronunciation Key
A natural process of self-destruction in certain cells, such as epithelial cells and erythrocytes, that are genetically programmed to have a limited life span or are damaged. Apoptosis can be induced either by a stimulus, such as irradiation or toxic drugs, or by removal of a repressor agent. The cells disintegrate into membrane-bound particles that are then eliminated by phagocytosis. Also called programmed cell death. |
The programmed death of a cell. Scientists believe that this process is governed by chemical signals a given cell receives from its neighbors.
Note: It is thought some forms of cancer may result when this process of cell death is somehow interrupted, allowing cells to grow unchecked, with the result being a cancerous tumor.