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.
The low density of the Moon means that it has less mass, and less gravity. If you ever get a chance to stand on the Moon, youâll see that its gravity is only 16.5% the gravity of Earth.In other words, if you weight 100 kg on Earth, you would only weigh 16.5 kg on the Moon.he low density of the Moon means that it has less mass, and less gravity. If you ever get a chance to stand on the Moon, youâll see that its gravity is only 16.5% the gravity of Earth.