Chapter 23, Problem 6CT

Summary Introduction

To determine:

Whether the thoracic wall will move inward, outward, or will not move at all if it is punctured at the end of a normal expiration.

Introduction:

During exhalation, relaxation of diaphragm and rib muscles takes place. Relaxation of rib muscles decreases the volume of thoracic cavity and diaphragm contracts so, air pressure increases inside it.