Conduction System

Question 1

AUTOMATICITY:

Answer 1

Hearts ability to create an electrical impulse

Question 2

CONDUCTIVITY:

Answer 2

Heart cells receives and moves electrical impulses

Question 3

EXCITABILITY:

Answer 3

Hearts ability to respond to impulse

Question 4

DEFINE the NERVOUS SYSTEM and SYMPATHETIC NERVOUS SYSTEM:

Answer 4

• Nervous System : Regulates heart speed

* Sympathetic Nervous System: Increases heart rate

Question 5

SINOATRIAL NODE (SA NODE):

Answer 5

• Located in the upper right atrium that provides electrical current
• Natural Pacemaker = 60-100 impulses per min = 1 beat

Question 6

ATRIOVENTRICULAR NODE (AV NODE):

Answer 6

• Located in the bottom right atrium that allows ventracils to fill with blood and release impulses
• Serves as a BACKUP PACEMAKER when SA is damaged, (40-60 beats per min)

Question 7

BUNDLE (AV BUNDLE):

Answer 7

• Allows electrical impulses to travel to ventricles

* Goes through the interventricular septum

Question 8

PURKINJE FIBERS:

Answer 8

• Electrical pathway for the left/right ventricle to contract
• Serves as a backup pacemaker for both AV and SA

Question 9

DEPOLARIZATION :

Answer 9

The state before a contraction, when the heart is stimulated for contract

Question 10

REPOLARIZATION:

Answer 10

State of recovery when cells return to its resting state and the chambers fill with blood

Question 11

What are the types of electrical waveforms?

Answer 11

• POSITIVE = Electricity traveling towards the patient’s electrode
• NEGATIVE = Electricity traveling away from the patients electrode
• NEUTRAL = A flat line with no electrical activity, a mismomer