* Diaphragm: This is a dome-shaped muscle that separates the chest cavity from the abdominal cavity. It plays a crucial role in breathing.

* Epiglottis: A small flap of cartilage that covers the windpipe (trachea) during swallowing.

* Esophagus: A muscular tube that carries food from the mouth to the stomach.

* Bolus: The ball of chewed food that is ready to be swallowed.

The diaphragm is the only one in this list that is a muscular membrane.