196,742 views
32 votes
32 votes
What allows the ribs to expand and contract with each breath?

User Louzoid
by
2.7k points

1 Answer

6 votes
6 votes

Answer:

What is the diaphragm

Step-by-step explanation:

During normal breathing, contraction of the major inspiratory muscle, the diaphragm, produces both rib cage expansion and a downward movement of the diaphragm. These movements cause the pressure around and in the lung to become negative relative to atmosphere.

User Mukul Gupta
by
2.9k points