What is the name of the muscle that separates the chest cavity from the abdominal cavity and aids in breathing?

Answer: Diaphragm

Detail: The diaphragm is a dome-shaped muscle located at the base of the ribcage that separates the thoracic cavity (containing the heart and lungs) from the abdominal cavity (containing the digestive organs). It plays a crucial role in the process of breathing by contracting and relaxing to create changes in thoracic pressure, allowing air to be drawn into the lungs during inhalation and expelled during exhalation. The diaphragm also assists in other bodily functions such as swallowing and vomiting.