Introduction

In the last lesson, we learned that there are 3 systems of the heart: plumbing, electrical, and mechanical. We discussed in depth the plumbing and mechanical systems. In this lesson, we will discuss the electrical system of the heart.

Image 1

Image 1 is an ECG tracing of the heart ("electrical system"). This is the electrical activity occuring in the heart to create contractions of the heart muscle. 

Notice the two ECG images below.  What is different between the two?
The first image is a normal ECG of a healthy heart. The second image is a heart in trouble and not able to pump blood out to the body. This heart would need to be shocked.

Image 1 Normal Rhythm of the Heart

Image 2 Abnormal Rhythm called V-Tach

Now, let's learn more about the heart and its electrical system.

Lesson Objectives

Following successful completion of this lesson, students will be able to...

  • Identify the structures of the heart through a diagram.
  • Explain the components of an electrocardiogram and how it is interpreted.
  • Diagnose cardiac disorders through a virtual lab diagnostic simulation.

Enduring Understandings

  • The cardiovascular system is composed of the heart, blood vessels, and blood.
  • The heart is the organ that pumps blood through blood vessels.
  • The cardiovascular system transports gases, nutrients, hormones, and wastes throughout the body.

The above objectives correspond with the Alabama Course of Study:Anatomy and Physiology standards: 7a and 7b

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