Maintenance of an organism

Maintenance of an organism is the collection of processes to stay alive, excluding prodiction processes. The Dynamic Energy Budget theory delineates two classes

• Somatic maintenance. This comprises the turnover of structural mass (mainly proteins), the maintenance of concentration gradients of metabolites across membranes, activity
• Maturity maintenance. This comprises the maintenance of defence systems (such as the immune system), the preparation of the body for reproduction.

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The theory assumes that maturity maintenance costs can be reduced more easily during starvation than somatic maintenance costs. Under extreme starvation conditions, somatic maintenance costs are paid from structural mass, which causes shrinking.Some organism manage to switch to the turpor state under starvation conditions, and reduce their maintenance costs.