The human heart is arranged in the center mediastinum, at the level of thoracic vertebrae T5-T8. A twofold membraned sac called the pericardium encompasses the heart and appends to the mediastinum.[15] The back surface of the heart lies close to the vertebral segment, and the front surface sits behind to the sternum and rib cartilages.[7] The upper piece of the heart is the connection point for a few huge veins – the venae cavae, aorta and aspiratory trunk. The upper piece of the heart is situated at the level of the third costal cartilage.[7] The lower tip of the heart, the peak, misleads the left of the sternum (8 to 9 cm from the midsternal line) between the intersection of the fourth and fifth ribs close to their enunciation with the costal cartilages.[7]
The biggest piece of the heart is normally marginally counterbalanced to one side of the trunk (however periodically it might be balanced to one side) and is felt to be on the left on the grounds that the left heart is more grounded and bigger, since it pumps to all body parts. Since the heart is between the lungs, the left lung is littler than the correct lung and has a cardiovascular indent in its fringe to oblige the heart.[7] The heart is cone-molded, with its base situated upwards and decreasing down to the apex.[7] A grown-up heart has a mass of 250–350 grams (9–12 oz).[16] The heart is regularly the span of a clench hand: 12 cm (5 in) long, 8 cm (3.5 in) wide, and 6 cm (2.5 in) in thickness.[7] Well-prepared competitors can have substantially bigger hearts because of the impacts of activity on the heart muscle, like the reaction of skeletal muscle.[7]
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