The Heart is really the only organ, but you must remember that EVERY organ receives blood from the circulatory system, so in essence, truly all organs are effected.
The circulatory system is composed of the heart, blood vessels, and blood. The heart pumps blood through blood vessels to transport oxygen, nutrients, hormones, and waste products throughout the body.
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The correct order from least to most complex is: heart cell, cardiac muscle, heart, circulatory system. A heart cell is the basic unit of structure and function, which combines to form cardiac muscle. The heart is an organ made up of cardiac muscle, and the circulatory system encompasses the heart along with blood vessels and blood, facilitating the transport of nutrients and oxygen throughout the body.
The circulatory system is like the highway system of the body. It collects all the needed components of life from place like you lungs and intestine, and carries and distributes them throughout your body where needed. It also collects used or bad chemicals and transports them to parts of the body for disposal or cleaning. Some blood cells only job is to fight off illness and the go where they are need via the circulatory system. All this is only the tip of the ice berg.
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After leaving the systemic veins, blood enters the heart to be pumped to the lungs. There is gives up its carbon dioxide, takes in oxygen, enters the heart again, and is pumped to the body through the arteries.
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