Which of the following does not occur when air enters the lungs?

A) Thoracic pressure decreases.
B) The diaphragm flattens.
C) The diaphragm relaxes.
D) The intercostal muscles raise the ribs.
E) The amount of space in the thoracic cavity increases.

Thoracic Pressure

The pressure within the thoracic cavity, affecting respiratory and cardiovascular functions, influenced by lung volume and diaphragm movement.

Diaphragm

A dome-shaped muscular partition separating the thorax from the abdomen in mammals, playing a major role in breathing.

Intercostal Muscles

Muscles located between the ribs that play a role in the breathing process.