In a dog that has developed normally, the heart's axis is placed obliquely in relation to the body's axis. The heart is more to the left side of the body than to the right (with 4/7 being on the left) and is flattened crosswise, which means that the right side of the heart is positioned cranially (toward the head) and the left side caudally (towards the tail). Thus, the base of the heart, where the blood vessels are located, is located cranially and dorsally, while the apex is positioned caudally and ventrally. The heart is located between the third and sixth ribs and its weight varies greatly depending on the breed.
-The heart is divided into four main parts: the right atrium receives deoxygenated blood and sends it to the right ventricle, which pumps it to the lungs; the left atrium receives the oxygenated blood from the lungs and sends it to the left ventricle, which in turn pumps it out to the various parts of the body.
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