Chapter 21, Problem 2CYR

Summary Introduction

To review:

The blank space in the statement “Air enters the lungs through hollow passages collectively known as the ______, which terminate in grapelike clusters called _______. The lungs are encased in the ______ membranes.”

Introduction:

The respiratory system of the human body primarily functions to aid gaseous exchange. It comprises manyorgans that assist in the process, eventually culminating by the exchange of oxygen and carbon dioxide between atmosphere and lungs. Respiratory system begins by inhaling oxygen through the nose, which then passes through the respiratory system and ends with exhaling out carbon dioxide.