Download C11.2 Notes - Destiny High School

Mr. B: Anatomy & Physiology II
Chapter 11 Lesson 2 Notes
Today’s 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.
Regulation of the Heart

The heart is _________________________ by three different ________________________. One inside the heart; the other two
_____________________________ of the heart:

_____________________________ control of the heart

external control

the ________________________________________ system
Internal Control of the Heart

_____________________________________ node
o
Known as the “______________________________” or the SA Node
o
Located at the top of the ___________________________ ___________________________
o
sends _________________________ impulse that tells the heart to ________________________________
o
tells heart to beat ________ – __________ bpm
External Control of the Heart


the cardiac center
o
_________________________ nerve system __________________________ up the heart rate
o
_________________________ nerve system __________________________ down the heart rate
o
Parasympathetic dominant branch at ____________________ which is why your heart rate is ________________ at rest.
the endocrine system
o
some _____________________________ speed up the heart _____________________________
o
________________________________ and norepinephrine increases heart rate
The Conduction System

________________________ is the process of conveying or _______________________ types of energy, such as
_______________________ impulses.

Includes two areas of ____________________________ tissue and a network of conduction ________________________.

These ______________________________ allow the electrical impulses formed by the ______________ node to travel to the
_________________________, telling them to contract.

The electrical impulse travels to the ___________________ atrium and goes through the ______________________________ node (AV
Node)

Once the electrical impulse ________________________ the AV node, it is carried through conducting fibers called the
________________________ of ____________________.
Electrocardiogram

Known as an ______________________ or ________________________
o
_________________________ of the electrical activity of the ____________________________
Mr. B: Anatomy & Physiology II
Chapter 11 Lesson 2 Notes
o
It illustrates what is happening _________________________________
o
Depolarize – _______________________________
o
______________________________ – relax
Cardiac Arrhythmias


normal ___________________________________ condition
o
______________________________ rhythm
o
A normal ________________________________ heart follows a ______________________________ rhythm.
__________________________________ contractility condition
o
arrhythmia

ventricle or _______________________________ contraction is not _____________________________

A beat can arrive too _____________________________ or beat in an abnormal way.

_____________________________ slow heart beat – less than 60 bpm

tachycardia
o

_____________________________ atrial contraction (PACs)
o

_____________________________, rather than SA node, cause beat
ventricular fibrillation (VF)
o

ventricles contract too soon
ventricular tachycardia (VT)
o

atria contract faster than ________________________ bpm
_____________________________ ventricular contractions (PVCs)
o

atria contracts before SA node
Can be caused by _____________________________ or _____________________________ atrial fibrillation
o

_____________________________ heart beat – above _________________ bpm
ventricles contract faster than _____________________________ bpm
heart block
o
_____________________________ from SA node to AV node are _____________________________ or blocked.

_____________________________ – impulse delayed

Second – _____________________________ blocked

Third - _____________________________ blocked
Defibrillators and Life-Threatening Arrhythmias

automatic external defibrillator (_____________________________)
o
Produces an _____________________________ shock
o
_____________________________ heart and allows the heart to start _____________________________l rhythm
o
_____________________________ can use one