Save
Busy. Please wait.
Log in with Clever
or
show password
Forgot Password?
Don't have an account?  Sign up 
Sign up using Clever
or
Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account. Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
edit
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Electrical EKG

electrical anatomy for EKG

QuestionAnswer
What are the 4 heart properties? automaticity excitability conductivity contractility
Define automaticity. cells ability to stimulate an electrical impulse without an external source
Define excitability. ability to respond to an impulse
Define conductivity. ability to receive and transmit impulse information to other cells
Define contractility. ability to contract when it is stimulated by an impulse; must have myofibrils present
What is present and missing from the conductive pathway of the heart? NO myofibrils NO contractility properties MORE gap junctions
Name the components of the atrial electrical system. SA node internodal pathways & Bachmann's bundle AV node
The SA node is known as the... pacemaker of the heart.
Where is the SA node is located? right atrium below the superior vena cava
What is the intrinsic rate of the SA node? 60-100 bpm
What are the internodal pathways? three pathways that connect the SA and AV node together
Where are the internodal pathways located? right atrium
Which of the internodal pathways is known as the FAST track? anteriosuperior track
Which of the internodal pathways is known as the SLOW track? posterioinferior track
Where is Bachmann's bundle located? left atrium
What are the three parts of the AV node? 1. transition zone 2. compact zone 3. trigger zone
What are the characteristics of the TRANSITION zone? located on the tip or covering of the AV node made of autonomic fibers arrhythmogenic (creates it own rhythm)
What are the characteristics of the COMPACT zone? core of the AV node similar tissue as SA node signal is SLOWED here backup pacemaker
Why is the signal slowed in the AV node? to allow for atrial contraction (otherwise all chambers would contract at the same time)
What is the intrinsic rate of the compact zone of the AV node? 40-60 bpm
What are the characteristics of the TRIGGER zone? connects AV node to bundle of His signal is SPED UP here
Name the components of the ventricular electrical system. bundle of His R & L bundle branches Purkinje fibers
What is the special purpose of the bundle of His? should be the ONLY line of communication between the atria and ventricles
What are characteristics of the LBB? one of the splits from the bundle of His splits into two parts shorter than RBB
The LBB splits into what two parts? left POSTERIOR fascicular left ANTERIOR fascicular
Which of the LBB fascicle is most common for blocks? left ANTERIOR
What are characteristics of the RBB? begins at the bundle of His and ends at the Purkinje fibers
What are the Purkinje fibers? where the LBB (left anterior & posterior fascicular) and RBB end
What is the intrinsic rate of the Purkinje fibers? 20-40 bpm
When cardiac cells are at REST, what are the charges inside and outside of the cell? positively charged on the outside negatively charged on the inside
Which ions are found on the inside of cardiac cells? POTASSIUM (K) sulfate phosphate
Which ions are found on the outside of cardiac cells? SODIUM (Na) CALCIUM (Ca)
What is an action potential? the change in the electrical charge of the cell which is based on the levels of Na, Ca, and K
What is depolarization? a shift in electrical charges within and outside of a cell an ACTION occurs
What is repolarization? restoration of the charges within and outside of a cell the RESET
How many phases occur during an action potential? 5 (0, 1, 2, 3, 4)
What happens during Phase 0? fast Na channels open and Na+ rushes into the cell rapid DEPOLARIZATION
What happens during Phase 1? fast Na channels close early REPOLARIZATION
What happens during Phase 2? Ca channels slowly open the PLATEAU
Ca is needed for what? muscle contractions
What happens during Phase 3? Ca channels close K channels open relative refractory period can occur here rapid REPOLARIZATION
What happens during Phase 4? Na/K pump ions switch places to reset RESTING PHASE
What is the ratio of Na+ to K+ as the pump returns the ions back to their original resting state? 3:2
What is relative refractory period? cell CAN respond to another stimulus, but was not at rest when it occurred
What is absolute refractory period? cell CANNOT respond to another stimulus
Created by: MrsReynolds
Popular Medical sets

 

 



Voices

Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
Retries:
restart all cards