The Circulatory System


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Function


The circulatory system is pretty simple, and has 2 circuits. In the pulmonary circuit, the oxygen-poor blood goes into the right atrium.The blood then goes down to the ventricles with still oxygen-poor blood. Then, the blood goes to the lungs. In the lungs, blood takes in a new supply of oxygen and gets rid of the carbon dioxide. The oxygen-rich blood then returns to the heart to be pumped through the systemic circuit. In the systemic circuit, the blood vessels bring oxygen and nutrients to the cells. They also carry waste like carbon dioxide away from the cells.The circulatory system is like a subway; it transports substances throughout the body. To watch a video about the circulatory system click here. Watch another video about EKG's here.
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The Blood Vessels Throughout the Human Body


Since the circulatory system transports everything, they need something to carry everything that needs to be moved. These are called blood vessels. One type of blood vessel is called veins. Veins carry substances to the heart. Superior and inferior vena cava are the two biggest veins. Oxygen-poor blood goes through these veins and into the hearts right atrium. Pulmonary veins bring oxygen-rich blood from the lungs to the left atrium. Another type of blood vessel is called arteries. The biggest artery is called the aorta artery. In that artery, oxygen-rich blood travels from the left ventricle to the cells throughout the body. Another type of artery is called pulmonary trunk, which carries oxygen-poor blood from the right ventricle to the lungs. Eventually, as the arteries get farther away from the heart, they branch out into smaller vessels called capillaries. Cells move through the walls of the capillaries. This is how cells enter the tissues of organs and muscles. In total, this system carries every needed substance through many different blood vessels.





The Heart and Blood Vessels


The circulatory system has one big organ, called the heart. It doesn’t look like a Valentines Day heart either. It has a circular shape and is located between both rib cages. The heart has 4 chambers, left and right atrium, which are on
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Red Blood Cells Traveling Through Blood Vessels
the top, and left and right ventricle, which are on the bottom. The way it works is that the blood goes into the atria. Then, the blood goes down into the ventricles and gets contracted out throughout the body. The heart has valves to control the amount of blood in a blood vessel and to keep the blood flowing. They are made up of muscles and tendons.

Throughout the body, valves are found almost everywhere and are not just located in the heart. The blood is a very important part of the system. It carries heat and is made up of cells suspended in a liquid called plasma. Plasma is made up of water, oxygen, carbon dioxide, sugars, salts, and proteins. Most of the cells that are suspended are red blood cells, which carry oxygen to the body’s cells. The heart and blood is a very important part of a human body.


Interaction With Other Systems
Without other systems, the circulatory system would not work. With the immune system, all of the white blood cells travel through the blood vessels. Also, the immune system heals blood vessels if they break. With the digestive system, the capillaries in the villi suck up the nutrients in the villi, to be transported throughout the body. With the nervous system, the brain gives signals to the heart, and the heart gives oxygen to the brain. The brain gives signals to the heart to pump the blood faster if for example you are exercising really hard. With the skeletal system, inside the bone marrow, is where red blood cells are produced. Also, the ribs provide protection to the heart. With the excretory system, one fourth of a quart of your blood goes to the kidneys to filet out unneeded substances. With the muscular system, the heart is completely made out of muscles. With the respiratory system, the lungs give oxygen to the heart and the circulatory system takes away the carbon dioxide. Also, the capillaries cover alveoli to give it oxygen rich blood. These are ways how the circulatory system needs other systems.

Health
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How a Heart Looks During a Heart Attack

Keeping the circulatory system healthy is very important. To do so, there is some things you should try to do daily like: eat 5 servings of fruits and vegetables, avoid sugary drinks, don’t smoke, eat a variety of healthy foods, exercise for at least 30 minutes, have a diet of low saturated and trans fat, and have a diet of low cholesterol and sodium. One disease of the system is Atherosclerosis, which is when artery walls thicken as a result of fatty materials. Another disease is hypertension, which happens when your blood pressure is too high. A third disease is heart disease, which happens when plaque clogs up arteries, which eventually can cause a heart attack. Another disease is a varicose vein, which happen to some people, as they get older. Varicose veins are caused by when your valves in your veins start to not work as well. Eventually what happens is that blood that should continue to move gets stuck in one place and new blood has a hard time passing which can also eventually cause a heart attack. But you can operate to remove this fatal disease. Another disease is MVP (Mitral valve prolapse) which is when the mitral valve, which is a valve in the heart buckles up (or swings upward) slightly into the atrium as they close. When the flaps don't close properly, blood can leak back into the left atrium, which may seem dangerous but most people with MVP live perfectly normal lives. Try your best to keep your system healthy because your life can be in danger if you don’t stay aware.