For example, dopamine plays a big role in starting movement, and the destruction of dopamine neurons in an area of the brain called the substantia nigra is what produces the symptoms of Parkinsonâs disease. Dopamine also plays an important role as a hormone, inhibiting prolactin to stop the release of breast milk.
Why are sunspots darker than the rest of the Sun? Sunspots appear dark (in visible light) because they are much cooler than the rest of the surface of the Sun. However, even though they appear dark, they are still very hot. Sunspots have temperatures around 6,300 Fahrenheit (~3,500 Celsius) while the surrounding surface of the sun has a temperature of about 10,000 Fahrenheit (5,500 Celsius). If a sunspot was alone in space, it would glow brightly.
sunspots are darker patches on the solar photosphere. their temperature is around 4000 degreesC. a large sunspot consists of a central darkish area or umbra, surrounded by a lighter area of penumbra which may be very extensive and irregular. sunspots tend to appear in groups and are associated with strong magnetic fields. they are also associated with solar flares. they are most common at the time of solar maximum, approx. every eleven years. no sunspot lasts for more than a few ...