Is the blood in the pulmonary artery low or high in

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Is the blood in the pulmonary artery low or high in oxygen?Is the blood in the pulmonary vein low or high in oxygen?What is the definition of an artery?What is the definition of a vein?Heart Blood Supply:The first branches off the aorta, which carry freshly oxygenated blood, are the right and left _____________ arteries that feed the heart muscle itself.Branches of these arteries feed many capillaries of the myocardium.The heart muscle requires a continuous supply of freshly oxygenated blood, so smaller branches of arteries often have _____________________ as alternate pathways for blood, should one pathway become blocked._____________________ veins drain blood from the heart muscle and carry it to the coronary ______________ which empties into the right atrium.What is a myocardial infarction?
During the cardiac cycle, pressure within the heart chambers rises and falls with the ________________and ____________________ of atria and ventricles.When the atria fill, pressure in the atria is ________________________ than that of the ventricles, which forces the ________________ valves open. Pressure inside atria rises further as they

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