1. Somatic Death (Clinical Death)
Permanent and irreversible cessation of the functions of the Brain, Heart and Lungs.
Features
- Absence of respiration.
- Absence of circulation.
- Loss of consciousness.
- Loss of reflexes.
2. Molecular Death (Cellular Death)
Death of individual cells and tissues after somatic death.
Features
- Occurs gradually.
- Different tissues die at different rates.
- Basis of organ transplantation and tissue survival after death.
Survival of tissues after somatic death
| Tissue | Approximate Survival |
|---|---|
| Brain cortex | 3–5 minutes |
| Heart muscle | 1–2 hours |
| Kidneys | Several hours |
| Skin | Several hours to days |
| Bone | Longest survival |