The diaphragma isn't attached to the heart. It separates the thoracic cavity from the abdominal cavity.
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The diaphragm separates the thoracic cavity (heart, lungs & ribs) from the abdominal cavity and performs an important function in respiration: as the diaphragm contracts, the volume of the thoracic cavity increases and air is drawn into the lungs.
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It attaches directly to the brain but not the heart
The heart is anchored to the diaphragm in order to keep it in place. The diaphragm also reduces friction to the outer membranes of the heart.
It separates the heart and lungs from the abdominal cavity.
Bibasal pneumonia means there is pneumonia in the lower lobes of both lungs. The heart and diaphragm and the boney thorax show no signs of problems.
intrathoracic, in mediastinum, anterior to esophagus and posterior to the diaphragm