Solutions For Admission Assessment Exam Review Chapter G Problem 3APT

Mediastinum (B) is formed of a membrane partition between body cavities or parts of organ. A prominent mediastinum is present within the thoracic cavity.

Liver (C) is an organ present in the abdominal cavity.

Lungs (D) are present in the thoracic cavity.

Therefore, these options are incorrect.

Diaphragm (A) is a sheet of skeletal muscle on the floor of the thoracic cavity that serves to separate the thorax from the abdomen. Movement of diaphragm increases thoracic volume and allows air to get into lungs.

Therefore, option (A) is correct.