Muscles are contractile tissues that produce force and cause motion through a process involving electrical impulses and metabolization of glucose, producing ATP and lactic acid.

References

"The muscle consumes oxygen and fuel that can be transported via a circulation system; the muscle itself supports the chemical reaction that leads to mechanical work; electrochemical circuits can act as nerves, controlling actuation; some energy is stored locally in the muscle itself; and, like natural muscle, the materials studied…contract linearly." (Madden 2006:1559)

Journal article
MATERIALS SCIENCE: Artificial Muscle Begins to BreatheScienceMarch 16, 2006
J. D. Madden

Journal article
Fuel-Powered Artificial MusclesScienceMarch 16, 2006
V. H. Ebron

Living System/s

Organism
MammalsMammaliaClass