Coughing up blood is the spitting up of blood or bloody mucus from the lungs and throat (respiratory tract). Hemoptysis is the medical term for coughing up blood from the respiratory tract. Coughing up blood is not the same as bleeding from the mouth, throat, or gastrointestinal tract. Blood that comes up with a cough often looks bubbly because it is mixed with air and mucus. It is most often bright red, although it may be rust-colored. Sometimes the mucus contains only streaks of blood.
A starter solenoid (or starter relay) is the part of an automobile which switches a large electric current to the starter motor, in response to a small control current, and which in turn sets the engine in motion.n idle starter solenoid can receive a large electric current from the car battery and a small electric current from the ignition switch.
Solenoids are used in a variety of systems, but most commonly in cars. Starters in particular use solenoids. Often when a vehicle's starter is malfunctioning the solenoid is the problem.