Do chest expansion help carry blood to the heart?

Chest expansion plays a role in respiration rather than directly aiding blood flow to the heart. When you inhale, the diaphragm and intercostal muscles expand the thoracic cavity, creating negative pressure that helps draw air into the lungs. This process also aids venous return, as the negative pressure can help pull blood back to the heart from the veins. However, chest expansion itself does not directly carry blood to the heart.