Atria would be empty during the atrial diastole.
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.
Oxygen transport and storage
(ik I gave three but just use two of them if you want)
The doctor would say that the person has Influenza depending on what symptoms the person has it could be influenza (A) or influenza (B). Hope that this helps.
