Share to: Red Blood Cell- 120 days life span White Blood Cell-The lifespan of white blood cells ranges from 13 to 20 days, after which time they are destroyed in the lymphatic system â¦ . Platelets-usually 10 -12 days These numbers do not include the amount of time it takes for them to mature in the bone marrow.ed cells transport oxygen in combination with the iron pigment, hemoglobin. The function of white blood cells is to fight infection, while platelets initiate the clotting nec â¦ essary to stop bleeding after a wound. Nutrients, wastes, hormones, antibodies, and enzymes are dissolved in the plasma.
Definition of Parabola. A parabola is the set of all points in a plane that are equidistant from the focus and the directrix of the parabola. The graph of any quadratic equation is a parabola.
To form a parabola according to ancient Greek definitions, you would start with a line and a point off to one side. The line is called the directrix; the point is called the focus. The parabola is the curve formed from all the points (x, y) that are equidistant from the directrix and the focus.