Fish have a "single loop" circulation and Amphibians have a "double loop" circulation.
Arteries Cary oxygenated blood. This is usually to organs or muscles with the exception of the pulmonary artery wich carries oxygenated blood from the lungs to the heart.
When you are exercising, oxygen is released from your body more rapidly. Due to this, your heart rate increases to carry oxygenated blood to your muscles and organs so that they stay in working order.
To the organs and extremities of the body
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The muscles responsible for ensuring that organs function properly are called smooth muscles. These muscles are found in the walls of organs such as the stomach, intestines, and blood vessels, and help to regulate the movement and function of these organs.
Lungs
Muscles are not organs. As far as bones, they are not vital organs. (not that I know of)
smooth muscles
To keep oxygenated blood flowing to the vital organs to sustain life.
To pump oxygenated blood to all organs of the body.
To pump oxygenated blood to all organs of the body.
Arteries carry oxygenated blood to the body tissues and organs. Veins carry deoxygenated blood from the tissues back to the heart and lungs where it becomes oxygenated again.