When contracted,this muscle causes expansion of the thoracic cavity and increases pressure in the abdominopelvic cavity.Its insertion is on a central tendon.
A)Internal intercostals
B)External intercostals
C)Transversus thoracis
D)Diaphragm
E)Serratus posterior inferior

Question

Quizplus · Accepted Answer

The diaphragm is the primary muscle responsible for expanding the thoracic cavity during inhalation. It contracts and flattens, causing a decrease in pressure in the thoracic cavity and an increase in pressure in the abdominopelvic cavity. Its insertion is on a central tendon, which separates the thoracic and abdominopelvic cavities.

When Contracted,this Muscle Causes Expansion of the Thoracic Cavity and Increases