MEDICAL
HEART AND PERICARDIUM
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Regarding the heart
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It is completely surrounded by pericardium that is attached to left dome of the diaphragm
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it has fossa ovalis laying on the interatrial septum
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it is supplied by coronary arteries that arise from the aortic sinuses
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sinuatrial node is the normal pacemaker
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mitral valve lies in the left atrioventricular orifice
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Explanation:
Detailed explanation-1: -The atrioventricular orifice of the left heart is the roughly circular aperture between the left atrium and the left ventricle that is surrounded by the mitral valve. When fully open, typically its circumference is about 8cm in the adult; it is smaller than the tricuspid orifice.
Detailed explanation-2: -The atrioventricular orifice is the aperture between the right atrium and right ventricle. It is patent on relaxation of the leaflets of the atrioventricular valve that surround it. The largest of any valve orifice, it is about 11cm in circumference and oval in cross-section.
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