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Put these parts of the heart in chrono order of blood flow beginning with blood...

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hinkberries | Student, Undergraduate | (Level 1) Honors

Posted September 6, 2011 at 5:34 PM via web

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Put these parts of the heart in chrono order of blood flow beginning with blood entering through superior and inferior vena cava...

Superior vena cava, Inferior vena cava, right pulmonary veins, right atrium, pulmonary valve, right ventricle, aortic arch, left pulmonary artery, pulmonary trunk, left atrium, circumflex artery, left ventricle

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boblawrence | (Level 1) Associate Educator

Posted September 16, 2011 at 7:01 AM (Answer #1)

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The correct arrangement of the structures listed in your question is as follows:

 

1.  Superior and Inferior Vena Cavae

2.  Right Atrium

3.  Right Ventricle

4.  Pulmonic Valve

5.  Left Pulmonary Artery

6.  Left Pulmonary Artery

7.  Right Pulmonary Veins

8.  Left Atrium

9.  Left Ventricle

10. Aortic Arch

11. Circumflex Artery

 

An expanded list containing some key structures not included in your question is as follows:

 

1.  Superior and Inferior Vena Cavae

2.  Right Atrium

3.  Tricuspid Valve

4.  Right Ventricle

5.  Pulmonic Valve

6.  Pulmonary Artery

7.  Right and Left Main Pulmonary Arteries

8.  Pulmonary circulation (pulmonary arteries, arterioles, capillaries, venules and veins)

9.  Right and Left Pulmonary Veins

10.  Left Atrium

11.  Mitral Valve

13.  Left Ventricle

14.  Coronary Circulation (left and right coronary arteries and left circumflex artery)

15.  Ascending Aorta

16.  Aortic Arch

17.  Large arteries to upper body

18.  Descending Aorta

19.  Lower Thoracic Aorta

20.  Abdominal Aorta

21.  Large Arteries to lower body

22.  Organ vascular beds (arteries, arterioles, capillaries, venules, veins)

23.   Superior and Inferior Vena Cavae

And so on.

 

Coronary Circulation:

As opposed to the systemic circulatory system (which provides blood to all organs other than the heart), the coronary system provides blood to the heart itself.  The right and left coronary arteries arise as openings at the base of the right and left cusp of the aortic valve in the form of ostia…the right and left coronary ostia.  The left main coronary artery gives off the left anterior descending (LAD) coronary artery with passes down along the anterior aspect of the left ventricle.  It also gives rise to the left circumflex coronary artery that passes posteriorly.  The right main coronary artery passes around the right upper portion of the heart and gives rise to the posterior descending branch that passes down the posterior aspect of the right ventricle.

 

The commonest sites of coronary artery occlusion (obstruction) leading to heart attacks are the proximal right coronary artery (usually s few centimeters from the right coronary ostium), and the proximal LAD (usually about one or two centimeters below or distal to the LAD’s origin from the left main coronary artery).  Coronary occlusions occur at the sites where there has been a build-up of arteriosclerotic plaque.  They can be from coronary thrombosis (clotting at the plaque site) or spasm of the vessel.

 

Systemic Circulation:  As opposed to the coronary circulation the systemic circulation constitutes the circulation to the entire body other than the heart.  It begins after the aortic valve where blood has left the heart, and ends in the superior and inferior vena cavae that bring deoxygenated blood from the organs back to the heart.

 

Summary:

The heart pumps blood through the coronary circulation to supply oxygen to the heart itself, and through the systemic circulation to supply the entire body other than the heart.

 

 

 

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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted September 6, 2011 at 10:16 PM (Answer #2)

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Deoxygenated blood from all parts of the body enters into the heart through the superior and inferior vena cava. The blood enters the right atrium. When the right atrium contracts the blood is pushed into the right ventricle through the tricuspid valve. On contraction of the right ventricle the blood gets pushed through the pulmonary valves into the pulmonary arteries to be sent to the lungs.

The blood is oxygenated in the lungs and enters the left atrium through the pulmonary veins. When the atrium contracts the blood is pushed into the left ventricle through the mitral or bicuspid valve.

When the left ventricle contracts the oxygenated blood enters the aorta through the aortic valve and is sent to all the parts of the body.

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