Choose the INCORRECT statements regarding to the thoracic chamber:

a) The thoracic chamber is formed ventrally by the vertebral column.

b) The thoracic chamber is formed ventrally by the sternum.

c) The thoracic chamber is formed laterally  by the dome-shaped diaphragm.

d) The thoracic chamber is formed on the lower side of ribs.

e) Any change in the volume of the thoracic cavity will be reflected in the lung (pulmonary) cavity.

a, c, d.

The correct answer is Option (3) - a, c, d.

The lungs are situated in the thoracic chamber which is anatomically an air-tight chamber. The thoracic chamber is formed dorsally by the vertebral column, ventrally by the sternum, laterally by the ribs and on the lower side by the dome-shaped diaphragm. The anatomical setup of lungs in thorax is such that any change in the volume of the thoracic cavity will be reflected in the lung (pulmonary) cavity. Such an arrangement is essential for breathing, as we cannot directly alter the pulmonary volume.