Acondition of the muscles whereby they become weak from disuse is called

A condition of the muscles whereby they become weak from disuse is called muscle atrophy.
 Atrophy is a weakening of the muscles that occurs after long periods where they are not used. Atrophy is characterized with decrease in the mass of the muscle.
Lack of physical activity is the main reason for atrophy.

Mitochondria is the cell organelle that produced the energy that is needed in the body system in form of atp, that is why it is called the power house of the cell. energy is needed by the living organisms to carry out the activities which sustain life.  if the mitochondria is destroyed atp will not be produced. if the mitochondria is destroyed, energy production will stop and the affected living organism will not have the energy to carry out the necessary life processes; this will lead to the death of the organism.