McKenzie
Health Science 20
NAME:_________________
Lesson 11.2 Regulation of the Heart
Objectives:
1. Describe the mechanisms that regulate the heart.
2. Describe different types of arrhythmia, or abnormal contractility conditions that can be
detected via electrocardiogram.
3. Identify the components of the conduction system of the heart.
Saskatchewan Outcome:
“I can analyze the anatomy and physiology of a healthy human”
Saskatchewan Indicators:
“I can describe the anatomy (structure) and physiology (function) of the cardiovascular system”
Before this lesson, try to answer the following questions:
1. What is the internal (intrinsic) mechanism that allows the heart to beat on its own?
ANSWER:____________________________________________________________________
2. What are the two external (extrinsic) systems that regulate the heart?
ANSWER:____________________________________________________________________
Key Terms:
 Arrhythmia
 baroreceptors
 depolarize
 premature atrial contractions
(PACs)
 Repolarize
 Tachycardia
References:
 Notes & handouts
 Textbook Pages: 375 – 381
 Study Guide Pages: 162 – 164






Atrial fibrillation
bradycardia
heart block
premature ventricular
contractions (PVCs)
Right bundle branches
Ventricular fibrillation




atrioventricular node (AV node)
bundle of His
left bundle branches
Purkinje fibers


Sinoatrial node (SA node)
Ventricular tachycardia
McKenzie
11.2 Regulation of the Heart
Internal Control (Intrinsic)
External Control (Extrinsic)
Health Science 20
NAME:_________________
McKenzie
The Conduction System
The Electrocardiogram
Health Science 20
NAME:_________________
McKenzie
Normal Sinus Rhythm
Sinus Bradycardia
Sinus Tachycardia
Premature Atrial
Contractions (PACs)
Atrial Fibrillation
Health Science 20
NAME:_________________
McKenzie
Health Science 20
NAME:_________________
Premature Ventricular
Contractions (PVCs)
Ventricular tachycardia
(VT)
Ventricular fibrillation
(VF)
Heart Block
Complete the Lesson
1. WATCH: The Heart, Part 2- Heart Throbs: Crash Course A&P #26 (https://www.youtube.com/watch?v=X9ZZ6tcxArI)
2. Read p. 375 - 381 in your textbook
3. Complete the “Check Your Understanding” Questions, p. 376, 377, 380
4. Correct your “Before this lesson” answers
5. Complete #1-5, p. 381
6. Study Guide pages 162 and 164 (handout)