Aplane passes through the breast, hip, and knee on only one side of the body.

A parasagittal plane passes through the breast, hip, and knee on only one side of the body.

Not including the median plane passing through the midline, the  parasagittal plane is situated alongside or parallel to the sagittal plane. Because viewing is achieved along the sagittal axis, such a section is often referred to simply as a "sagittal" view.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%