Manganese Mn Atomic Number: 25 Atomic Mass: 54.938 _______________________________________________________________________________ Human Physiology: - Activates numerous enzymes - Catalyses synthesis of fatty acids and cholesterol - Foundation of thyroxin Prevalence: - Widely distributed throughout environment Sources: - Whole grain cereals, egg yolks - Nuts, seeds - Green vegetables Excess: - Weakness, irritability - Early: intellectual deficits, mood changes, compulsive behavior, and inappropriate laughter - Later: Parkinson's like illness, mask-like face, limb rigidity, gait disturbance, slurred speech, excessive salivation and sweating, poor balance