The _______ is a Strong, Dome-Shaped Muscle and is the Floor

Question

The _______ is a strong, dome-shaped muscle and is the floor of the thoracic cavity.
A) alveolus
B) diaphragm
C) intercostal
D) visceral pleura

Accepted Answer

The diaphragm is a strong, dome-shaped muscle and is the floor of the thoracic cavity. A is incorrect because alveolus is a small sac found within the lungs where gas exchange occurs. C is incorrect because intercostal refers to the muscles between the ribs. D is incorrect because visceral pleura is the membrane that covers the lungs.