The '2-chambered pump' refers to the relationship between which cavities?

The '2-chambered pump' refers to the relationship between which cavities?

• A. Thoracic and abdominal cavities
• B. Left atrium and right ventricle
• C. Lungs and heart
• D. Brain and spinal cord

Answer: (A)

The idea behind the two-chambered pump is the functional link between the thoracic and abdominal cavities created by the diaphragm. As you breathe in, the diaphragm contracts and moves downward, expanding the thoracic cavity while compressing the abdominal contents. This lowers pressure in the chest and increases pressure in the abdomen, helping venous blood and lymph flow from the abdomen toward the heart and through the thoracic region. As you breathe out, the diaphragm relaxes and rises, shifting pressures to continue aiding fluid movement and venous return. This coordinated movement effectively couples the two major body compartments, acting like a pump that moves fluids between them. The other options don’t describe this diaphragmatic coupling between the chest and belly.

The idea behind the two-chambered pump is the functional link between the thoracic and abdominal cavities created by the diaphragm. As you breathe in, the diaphragm contracts and moves downward, expanding the thoracic cavity while compressing the abdominal contents. This lowers pressure in the chest and increases pressure in the abdomen, helping venous blood and lymph flow from the abdomen toward the heart and through the thoracic region. As you breathe out, the diaphragm relaxes and rises, shifting pressures to continue aiding fluid movement and venous return. This coordinated movement effectively couples the two major body compartments, acting like a pump that moves fluids between them. The other options don’t describe this diaphragmatic coupling between the chest and belly.