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Flashcards in EKG (FINAL) Deck (25)
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1

Define tachycardia

  • Rapid beating of the heart
  • Typically over 100 bpm

2

Define fibrillation

  • Rapid, irregular, and unsynchronized contraction of the heart

3

Define bradycardia

  • A slow heart rate
  • Typically a resting heart rate of under 60 bpm

4

What are electrocardiograms also known as? 

EKG

5

 What are electrocardiograms? 

An electrocardiogram (EKG) is a graphic recording of the electrical changes of the cardiac cycle

6

What do EKGs measure? 

  • Electrical changes of the cardiac cycle consisting of:
    • Voltage
    • Time 

7

Describe the cellular structure of cardiac muscle

  • Cardiac muscle characterisitics
    • Striations
    • Branching
    • Intercalated dics
    • Involuntary 

8

What is the purpose of an EKG?

Diagnostic tool

9

What do EKGs not measure? 

EKGs do not measure blood flow 

10

What do EKGs use for recordings? 

EKGs uses pairs of electrodes (leads) 

11

What are the purpose of an EKG's leads/electrodes? 

Look at the heart from different angles

12

What are the controlling systems of the cardiac cycle? 

13

What type of junctions does the cardiac muslce have? 

Gap junctions

14

Define gap junction

  • Gap junction
    • A junction between adjacent animal cells that allows the passage of materials between the cells 

15

How does the cardiac muscle cells exhibit automaticity?

  • The cardiac cell's ability to spontaneously generate an electrical impulse (depolarize).
  • Cells that are dedicated to the purpose of generating an impulse to maintain a heart rate commensurate with the body's need are called pacemaker cells.

16

How does the myocardium function as a single unit? 

  • Some cardiac muscle cells are self-excitable or autorhythmic.
    • These cells generate an action potential that spreads throughout the myocardium 
    • Causing the heart to contract as a single unit

17

What are the two controling systems for cardiac muscle? 

  1. Autonomic nervous system

  2. Intrinsic conduction system (nodal system) 

18

Right Atrium

  • Recieves deoxygenated blood from the vena cavas

19

Sinoatrial node (SA node)

  • "Pacemaker"
  • Located in the upper posterior wall of the right atrium

20

What is the function of X?

  • Sinoatrial Node (SA Node) 
    • ​Pacemaker
    • An electrical signal originates within the SA node
      • The electrical signal is called the action potential  or the cardiac impulse

21

  • Atrioventricular node (AV node) 
    • Located in the floor of the right atrium, near the interatial septum 

22

What happens to the cardiac impulse at X? 

  • Atrioventricular node (AV) 
    • ​The cardiac impulse slows down as it moves through the AV node into the bundle of His

23

Why is it important for the cardiac impulse to slow down as it moves through the AV node? 

  • The slow movement delays ventricular activation 
    • ​Allowing the relaxed ventricle to fill with blood during atrial contraction 

24

Purkinje Fibers

 

25