A Shortage of Dopamine. Parkinson's disease occurs when nerve cells, or neurons, in an area of the brain that controls movement become impaired and/or die. Normally, these neurons produce an important brain chemical known as dopamine, but when the neurons die or become impaired, they produce less dopamine.arkinson's disease occurs when nerve cells, or neurons, in an area of the brain that controls movement become impaired and/or die. Normally, these neurons produce an important brain chemical known as dopamine, but when the neurons die or become impaired, they produce less dopamine.
Weight density is not a term. Weight is the effect of gravity on a Mass and will be less on the Moon since the moon has less mass and therefore less gravity than the Earth.Density is mass/volume and since mass is constant, density would also be constant.aking the world better, one answer at a time. Weight density is not a term. Weight is the effect of gravity on a Mass and will be less on the Moon since the moon has less mass and therefore less gravity than the Earth. Density is mass/volume and since mass is constant, density would also be constant.
â¢ Assume the Earth and Moon are perfect spheres. â¢ Mass of Earth = 5.9376Ã1024kg, Moonâs mass = 7.3477Ã1022kg. â¢ Radius of Earth = 6378.750km, radius of Moon = 1737.4km. â¢ Earth-moon distance (center to center) is 384403km. â¢ The force due to gravity between two objects of mass M1 and M2 a distance. r apart is. F =.