Chapter 19

Respiratory and Excretory Systems

19.1 Lesson 19.1: Respiratory System

Lesson Objectives

• Identify the parts of the respiratory system.


• Identify the main function of the respiratory system.


• Describe how breathing works.


• Outline how the respiratory system and the cardiovascular system work together.


• Identify how breathing and cellular respiration are connected.

Check Your Understanding

• What is an organ system?


• What is the role of the circulatory system?


• How does your blood get oxygen?

Introduction

You breathe mostly without thinking about it. But, do you remember how uncomfortable
you felt the last time you had a cold or a cough? You usually do not think about your
respiratory system or how it works until there is a problem with it. Every cell in your body
depends on your respiratory system. In this lesson, you will learn how your respiratory
system works with your cardiovascular system to bring oxygen to every cell in your body.