The Wikipedia page on Arteries provides an in-depth overview of the major blood vessels in the human body that carry oxygenated blood from the heart to the various organs and tissues.

The Wikipedia page for "Cell (biology)" provides an extensive overview of the fundamental unit of life - the cell.

Fluid is a state of matter in which particles are free to move and flow.

The heart is a crucial organ in the circulatory system that pumps blood throughout the body.

A heart valve is a part of the human heart that controls blood flow by opening and closing as the heart pumps.

Mayo Clinic is a non-profit academic medical center located in Rochester, Minnesota.