The main components are: ( 1 pressure) cylinder, also called working cylinder (7) 2  piston (4) connected to a piston rod (5) 3  floating piston, also called separating piston (2) 4  piston rod guide (6) 5  upper and lower attachment.
Vitamin B12 is a nutrient that helps keep the body's nerve and blood cells healthy and helps make DNA, the genetic material in all cells. Vitamin B12 also helps prevent a type of anemia called megaloblastic anemia that makes people tired and weak. Two steps are required for the body to absorb vitamin B12 from food.
Vitamin B12 deficiency. Vitamin B12 is important for the way the body works, and people who don't have enough of it may feel tired or have a lack of energy. Vitamin B12 helps in the production of healthy red blood cells that carry oxygen around the body.