The heart is located in which body cavity?

• A. Cranial cavity
• B. Thoracic cavity
• C. Abdominal cavity
• D. Spinal cavity

Answer: (B)

Identifying where organs sit inside the body cavities. The heart lives in the thoracic cavity, specifically in the mediastinum—the central compartment of the chest. It’s enclosed within the pericardial cavity inside the serous pericardium, and the whole area is bounded anteriorly by the sternum, posteriorly by the vertebral column, and below by the diaphragm. This thoracic space houses the heart and lungs, distinct from the cranial cavity (which contains the brain), the spinal cavity (which contains the spinal cord), and the abdominal cavity (which houses many digestive organs).