Heart is surrounded by how many layers of connective tissue, three layers, four layers, two layers, which chambers of heart receive oxygenated blood, Right atrium and right ventricle, right atrium and right ventricle, Left atrium anf left ventricle, Right and lefty ventricle, Which out of the following is pacemaker of heart, AV node, SA node, Bundle of His, Right bundle branch, Arteries supplying blood to heart musculature itself are, aorta, Pulmonary artery, Coronary artery, Coronary sinus, Blood from superior vena cava drain into which of the following chamber of heart, Left atrium, Right atrium, Left ventricle, Right ventricle.

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