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Circulatory system

Covering the basics of the circulatory system function and jobs that it must complete in order for the body to perform up to the best of it's abilities.

Trey Walters

on 4 May 2010

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Transcript of Circulatory system

The circulatory system's job is to control the flow of the blood in the body and get nutrients and oxygen to the respiratory system. Making this task possible are an abundance of vessels and muscles. Among these are the heart, arteries, veins and capillaries.
VEINS ARTERIES CAPILLARIES Veins are similiar to areteries, but because they transport blood at a lower pressure they are not as strong and therefore not as important as arteries. Most veins carry deoxygenated blood from the tissues back to the lungs and their job is to return deoxygenated blood back to the heart.
Why are there so many vessels working to control the flow of blood or in other words; why is the circulatory system so important. The reason it's so important is because red blood cells are similiar to billions of UPS trucks as they carry all sorts of packages that are needed by all cells within the body. Although instead of UPS, they're called RBC's. RBC's deliver oxygen and other nutrients throughout the body.
Aside from RBC's there are also white blood cells moving along on the streets of the Circulatory System Highway. WBC's are like the police, ambulance, and fire fighters that come to our rescue when in trouble. The highway in which these blood cells travel have alot of one way streets. The superhighways of the circulatory system are the veins and arteries and capillaries are the many two way streets.
Veins carry blood to the heart. Arteries carry blood away from the body. Most of the time arteries carry blood that is loaded
with oxygen and other nutrients giving it a bright red color. The muscle that pumps the blood throughout the body is no other the heart. The Heart The heart is a two-sided, four chambered pump. Considering that the heart is the fuel for the billions of RBC's and millions of WBC's it is arguable the most important muscle within the entire human body. The right side of the heart is the low pressure side, it pushes RBC's up to the lungs so that they can recharged with oxygen. It's like the truck stop for the UPS. The RBC's are pumped into the right atrium. Since the right atrium is above the right ventricle, gravity helps the heart make an easy spueeze through the tricuspid valve and into the right ventricle. The tricuspid valve is composed of three openings, or 'leaflets' that allows blood cells to travel to the top and bottom. The tricuspid however momentarily closes to prevent a backup when the RBC's are traveling from the right atrium to the right ventricle. The blood leaves the right ventricle and enter the pulmonary artery. Note: Arteries can also be oxygenated, arteries rather just carry blood away from the heart. When the blood leaves the pulmonary artery it enters many special capillaries located within the lungs. These capillaries are special because if a capillary is located within the lungs, they are against air sacks. Within air sacks are oxygen, therefore this is like a loading dock for RBC's to pick up oxygen.
After the RBS is loaded with oxygen, it now enters cardiac veins. The cardiac veins than empty into the left atrium. The left side of the heart is to deliver the oxygen to the body. The left atrium is above the left ventricle and is seperated by the mitral valve. The mitral valve gets it's name because it reminds some people of Bishop's Mitered Hat. This valve's job is the same as the tricuspid valve as it prevents blood from being pushed from the left ventricle back to the left atrium. The left ventricle is a high pressure pump because it's given the job to create enough pressure to push the blood out of the heart and into the body's circulation. When the RBC's leave the left ventricle it travels to the aorta. At the entrance of the aorta are valves that prevent the RBC's from backing up into the ventricle. The instant the blood enters the aorta, coronary arteries take some of the blood and use it to nourish the heart. The blood leaves the heart and heads towards the head. The arteries that take the blood from the heart to the head is known as the aortic arch. After it travels through the aortic arch is sent throughout the rest of the body by traveling through the descending aorta. The descending aorta goes behind the heart and down the center of the body. After exiting the aorta, RBC's are sent to other arteries and arterioles located throughout the body. When the oxygen rich RBC's spread throughout the body, they deliver oxygen and nutrients to all the cells of the body. It delivers the oxygen and nutrients as they exit the arterioles, passes through the capillaries into numerous venules. Arterioles are very small arteries &
venules are very small veins. The deoxygenated blood than travels from the venules into veins. These veins than connect to the two largest veins in the body known as superior and inferior veins. The superior vena cava sends blood the upper part of the body back to the heart and the inferior vena cava sends blood from the lower part of the body back the heart. Both vena cava's end at the right atrium. superior means above &
inferior means below Mr. D
Johnson, Delos. "Global Classroom."
Online. Available:http://www.globalclassroom.org/hemo.html Information found: Pictures found at various sources Though we are done going through the cycle of the circulatory system, under some occasions the circulatory system helps other systems complete a certain task. One of these tasks is the cooling of the body; by starting the process with the evaporation of water and ending it with sweating. The circulatory system works together with the integumentary system to form the cooling system. Now that you know how important the circulatory system is you might want to take care of it. If you don't there are certain diseases like anaemia and sickled-celled anaemia. Ways you can prevents this is by eating a balanced diet, getting in plenty of exercise, and plenty of rest.
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