What is the difference between coronary and pulmonary artery?

Question

I really can't get the big picture where is the coronary artery!

Answer 1

Coronary artery is a branch off the ascending aorta. Please check out the link (or a book) for information on the circulatory system.

Answer 2

Coronary Pulmonary

Answer 3

The arteries goes from heart into another parts of the organism. The veins come into the heart.

But think of this: when an vein goes from the lung into the heart, the blood is not "used" blood, as in the other veins case.

So, this is a big difference between the other arteries and the pulmonar artery.

The coronary artery is the artery that feed the heart itself. So it functions like any other artery.

Ana

Answer 4

Coronary artery supplies the blood to the wall of Heart.
Pulmonary artery carries deoxygenated blood to the lungs.

Answer 5

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the bicuspid is the same as the mitral valve it seems like anatomy has 12 names for everything In anatomy, the heart valves maintain the unidirectional flow of blood in the heart by opening and closing depending on the difference in pressure on each side. They are mechanically similar to reed valves. There are four valves in the heart (not counting the valve of the coronary sinus, and the valve of the inferior vena cava): The two atrioventricular (AV) valves between the atria and the ventricles, also called tricuspid and bicuspid. The two semilunar (SL) valves, in the arteries leaving the heart, also called pulmonary and aortic. This I know for sure. Drawing pictures always helped me keep it straight and I just got an A in anatomy. best of luck to you

Answer 6

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Answer 7

coronary from heart,pulmonary from lungs

Answer 8

There are 4 valves on the heart. Right atrium Left ventricle Left atrium Right ventricle. The atriums are the top of the heart...the more smaler ones and the ventricles are th larger ones which are below the atriums.

Answer 9

The coronary circulation consists of the blood vessels that supply blood to, and remove blood from, the heart muscle itself. Although blood fills the chambers of the heart, the muscle tissue of the heart, or myocardium, is so thick that it requires coronary blood vessels to deliver blood deep into the myocardium. The vessels that supply blood high in oxygen to the myocardium are known as coronary arteries. The vessels that remove the deoxygenated blood from the heart muscle are known as cardiac veins.

The coronary arteries that run on the surface of the heart are called epicardial coronary arteries. These arteries, when healthy, are capable of autoregulation to maintain coronary blood flow at levels appropriate to the needs of the heart muscle. These relatively narrow vessels are commonly affected by atherosclerosis and can become blocked, causing angina or a heart attack.

The coronary arteries are classified as "end circulation", since they represent the only source of blood supply to the myocardium: there is very little redundant blood supply, which is why blockage of these vessels can be so critical.


Coronary anatomy
The exact anatomy of the myocardial blood supply varies considerably from person to person. A full evaluation of the coronary arteries requires cardiac catheterization.

In general there are two main coronary arteries, the left and right.

Right coronary artery
Left coronary artery
Both of these arteries originate from the beginning (root) of the aorta, immediately above the aortic valve. As discussed below, the left coronary artery originates from the left aortic sinus, while the right coronary artery originates from the right aortic sinus.


Variations
Four percent of people have a third, the posterior coronary artery. In rare cases, a patient will have one coronary artery that runs around the root of the aorta.

Occasionally, a coronary artery will exist as a double structure (ie there are two arteries, parallel to each other, where ordinarily there is one). Dana Carvey has this variation, which led to a mishap during his CABG operation.


Coronary artery dominance
The artery that supplies the posterior descending artery (PDA) and the posterolateral artery (PLA) determines the coronary dominance.

If the right coronary artery (RCA) supplies both these arteries, the circulation can be classified as "right-dominant".
If the left circumflex artery (LCX) supplies both these arteries, the circulation can be classified as "left-dominant".
If the RCA supplies the PDA and the LCX supplies the PLA, the circulation is known as "co-dominant".
Approximately 70% of the general population are right-dominant, 20% are co-dominant, and 10% are left-dominant. [1]


Blood supply of the papillary muscles
The papillary muscles tether the mitral valve (the valve between the left atrium and the left ventricle) and the tricuspid valve (the valve between the right atrium and the right ventricle) to the wall of the heart. If the papillary muscles are not functioning properly, the mitral valve leaks during contraction of the left ventricule. This causes some of the blood to travel "in reverse", from the left ventricle to the left atrium, instead of forward to the aorta and the rest of the body. This leaking of blood to the left atrium is known as mitral regurgitation.

The anterolateral papillary muscle receives two blood supplies: the LAD and LCX, and is therefore somewhat resistant to coronary ischemia. On the other hand, the posteromedial papillary muscle is supplied only by the PDA. This makes the posteromedial papillary muscle significantly more susceptible to ischemia. The clinical significance of this is that a myocardial infarction involving the PDA is more likely to cause mitral regurgitation.


Coronary flow
During contraction of the ventricular myocardium (systole), the subendocardial coronary vessels (the vessels that enter the myocardium) are compressed due to the high intraventricular pressures. However the epicardial coronary vessels (the vessels that run along the outer surface of the heart) remain patent. Because of this, blood flow in the subendocardium stops. As a result most myocardial perfusion occurs during heart relaxation (diastole) when the subendocardial coronary vessels are patent and under low pressure. This contributes to the filling difficulties of the coronary arteries.

The primary determinant of coronary blood flow is the level of myocardial/cardiac oxygen consumption. As the heart beats more vigorously, ATP is consumed at a greater rate due to the increased force and/or frequency of contraction and the depolarization and repolarization of the cardiac membrane potential. The increase in oxygen consumption results in the release of a vasodilator substance, the identity of which remains unknown. The vasodilator reduces vascular resistance and allows more blood to flow through the heart during each diastole. Systolic compression remains the same. Failure of oxygen delivery via increases in blood flow to meet the increased oxygen demand of the heart results in tissue ischemia, a condition of oxygen debt. Brief ischemia is associated with intense chest pain, known as angina. Severe ischemia can cause the heart muscle to die of oxygen starvation, called a myocardial infarction. Chronic moderate ischemia causes contraction of the heart to weaken, known as myocardial hibernation.

In addition to metabolism, the coronary circulation possesses unique pharmacologic characteristics. Prominent among these is its reactivity to adrenergic stimulation. The majority of circulation in the body constrict to norepinephrine, a sympathetic neurotransmitter the body uses to increases blood pressure. In the coronary circulation, norepinephrine elicits vasodilation, due to the predominance of beta-adrenergic receptors in the coronary circulation. Agonists of alpha-receptors, such as phenylephrine, elicit very little constriction in the coronary circulation.





The pulmonary arteries carry blood from the heart to the lungs. They are the only arteries (other than umbilical arteries in the fetus) that carry deoxygenated blood.

In the human heart, the pulmonary trunk (pulmonary artery or main pulmonary artery) begins at the base of the right ventricle. It is short and wide - approximately 5 cm (2 inches) in length and 3 cm (1.2 inches) in diameter. It then branches into two pulmonary arteries (left and right), which deliver deoxygenated blood to the corresponding lung.


Role in disease
Pulmonary hypertension occurs alone and as a consequence of a number of lung diseases. It can be a consequence of heart disease (Eisenmenger's syndrome) but equally a cause (right-ventricular heart failure); it also occurs as a consequence of pulmonary embolism and scleroderma. It is characterised by reduced exercise tolerance. Severe forms, generally, have a dismal prognosis.

Answer 10

One goes to the heart, the other to the lungs.


Doug