Molecular oxygen, O2, is essential for cellular respiration in all aerobic organisms. Oxygen is used as an electron acceptor in mitochondria to generate chemical energy. Take a look inside the cell to see these powerhouses of the cell, petite organelles mitochondria, click here.
1 : the action of perturbing : the state of being perturbed. 2 : a disturbance of motion, course, arrangement, or state of equilibrium; especially : a disturbance of the regular and usually elliptical course of motion of a celestial body that is produced by some force additional to that which causes its regular motion.
Princeton's WordNet(0.00 / 0 votes)Rate this definition: disturbance, perturbation, upset(noun) an unhappy and worried mental state. there was too much anger and disturbance; she didn't realize the upset she caused me. upset, derangement, overthrow(noun) the act of disturbing the mind or body.