Lung cancer is the top cause of cancer deaths in both men and women. But this wasn't always the case. Prior to the widespread use of mechanical cigarette rollers, lung cancer was rare. Today, smoking causes nearly 9 out of 10 lung cancer deaths, while radon gas, pollution, and other things play a smaller role.
From Wikipedia, the free encyclopedia. A plane symmetry is a symmetry of a pattern in the Euclidean plane: that is, a transformation of the plane that carries any directioned lines to lines and preserves many different distances. If one has a pattern in the plane, the set of plane symmetries that preserve the pattern forms a group. The groups that arise in this way are plane symmetry groups and are of considerable mathematical interest. A symmetry plane is a three-dimensional object's symmetry axe. There are several kinds of plane symmetry groups: Reflection groups.
A plane is an imaginary flat surface passing through the body or organ which divides the structure. 1) Frontal (Coronal) Plane: is vertical and extends from one side of the body to the other. It divides the body into front and back sections. 2) Sagittal (Medial) Plane: is vertical and extends from the front of the body to the back. It divides the body into right and left sections. 3) Transverse (Horizontal) Plane: is horizontal and divides the body into upper and lower segments. Axes of Rotation The human body is also divided into anatomical axes Axis of rotation is an imaginary line (point of rotation) that passes through a joint or the body to describe the movement.