Pick the correct statement

Options

A. The contraction of internal intercostal muscles lifts up the ribs and sternum
B. The RBCs transports oxygen only
C. The thoracic cavity is anatomically an airtight chamber
D. A healthy man can inspire approximately `500` ml of air per minute

Answer

C

Explanation

Thoracic chamber is an airtight chamber which lodges the lungs. It is guarded dorsally by the vertebral column, ventrally by sternum laterally by ribs and diaphragm on the lower side.