The heart is a midline, valvular, muscular pump that is conetshaped and the size of a fist. It weighs 300 g in adults and lies in the middle mediastinum of the thorax.
文摘The heart is a midline, valvular, muscular pump that is conetshaped and the size of a fist. It weighs 300 g in adults and lies in the middle mediastinum of the thorax.
