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.
One description of a parabola involves a point (the focus) and a line (the directrix). The focus does not lie on the directrix. The parabola is the locus of points in that plane that are equidistant from both the directrix and the focus.he point on the parabola that intersects the axis of symmetry is called the  vertex , and is the point where the parabola is most sharply curved. The distance between the vertex and the focus, measured along the axis of symmetry, is the focal length.