It called the Pectoral muscles
There are three kinds of blood vessels: arteries, veins, and capillaries. Each of these plays a very specific role in the circulation process. Arteries carry oxygenated blood away from the heart. They're tough on the outside but they contain a smooth interior layer of epithelial cells that allows blood to flow easily.
Answer:
Osmosis is a special type of diffusion, namely the diffusion of water across a semipermeable membrane .
