An angiogram uses X-rays and a special dye (contrast) to take pictures of the arteries in your brain, heart, and kidneys. The dye is injected into a small tube or catheter into an artery in your groin or (sometimes) your arm.
As the cloud collapses the force of gravity drawing the cloud inward gradually becomes stronger because the strength of gravity follows an inverse square law with distance. hoâ¦pe that helps.
Nov 10, 2011. Think about what establishes intrapleural pressure. The lungs want to collapse and the chest cavity wants to expand -> negative pressure between them in intrapleural space. The effect of gravity at the apex can be interpreted as an additional collapsing force on the lungs. Not only do the alveoli want to collapse because of intrinsic properties, gravity is also pushing on alveoli at the apex, resulting in a greater collapsing force and a more negative intrapleural pressure.