In multiple sclerosis, the protective coating on nerve fibers (myelin) is damaged and may eventually be destroyed. Depending on where the nerve damage occurs, MS can affect vision, sensation, coordination, movement, and bladder and bowel control. Multiple sclerosis (MS) is a potentially disabling disease of the brain and spinal cord (central nervous system). In MS, the immune system attacks the protective sheath (myelin) that covers nerve fibers and causes communication problems between your brain and the rest of your body. Eventually, the disease can cause the nerves themselves to deteriorate or become permanently damaged.
NEXT PAGENEXT. Internal combustion means just what it says: that fuel is burned inside the engine. In a car engine, gasoline is burned inside the engine, which ignites the fuel and releases energy that moves the car. There are also other methods of internal combustion, such as diesel engines and gas turbine engines. Internal combustion is an efficient system that requires a relatively small engine to create motion.
The steam engine is the classic example of external combustion. While steam technology is rarely used today, it has served as inspiration for other modern technologies that rely on external combustion to power a device. During external combustion, some type of fuel is burned within an independent combustion chamber. Lines filled with fluid transfer this heat energy into the motor, where the sudden increase in heat is used to drive one or more pistons.