Ignition is usually the easiest of the three to check because on most engines, all you have to do is pull off a plug wire and check for spark when the engine is cranked. On coil-over-plug DIS systems, there are no plug wires so you have to remove a coil and use a plug wire or adapter to check for a spark.
Stress can affect every part of your body. muscle aches, head aches, how your hair grows, the texture of your skin, it can affect your menstrual cycle.
Glands in The Human Body. Glands in the human body produce, control and regulate the flow of hormones, breast milk, saliva, and other useful fluids. Mental stress influences the flow of hormones and other fluids as well. This article explains the significance of glands in metabolism, growth and reproduction.