Hypertension, heart disease, and stroke are related by the process of atherosclerosis. Atherosclerosis refers to the build-up and accumulation of fatty substances (also known as plaque) in the inner walls of the arteries. Atherosclerosis can lead to hypertension, heart disease, and strokes.
They always move, so its hard catching them still, and if they are in action, you can't get a good picture because it will come out blurry. Hope this helps. Let me know if you need anything else.
These refer to an aspect ratio of an image.