Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

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.
We do not share your email address with others. It is only used to allow you to reset your password. For details read 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.
Didn't know it?
click below
Knew it?
click below
Don't know
Remaining cards (0)
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

physiology lab

3/23 electrical activity of the heart / the ECG

2 specialized types of cardiac muscle cells contractile myocardial cells and non contractile autorhythmic cells
__cells responsible for the mechanical pumping of the heart contractile myocardial cells
99% for cardiac muscle tissue are ___ cells contractile myocardial cells
___ cells of the conduction system are responsible for electrical stimulation of myocardial cells non contractile autorhythmic cells
__cells are 1% of cardiac muscle tissue non contractile autorhythmic cells
__cells spontaneously depolarize via slow movement of + ions through channels leading to threshold then generating an AP autorhythmic cells
AP travels throught the conduction system triggering the contraction of the surrounding myocardial tissue
different parts of the hearts conduction system have their own _ rate autorhythmicity rate
4 Components of the conduction system SA node, AV node, AV Bundle, and Purkinje fibers
autorhythmicity rate of 70 beats/min SA node
autorhythmicity rate of 50 beats/min AV node
autorhythmicity rate of 35 beats/min AV bundle
autorhythmicity rate of 30 beats/mini Purkinje fibers
a recording of the electrical changes that accompany the cardiac cycle electrocardiogram (ECG)
represents the depolarization of the atria as a wave of negativity spreads from the SA node toward the ventricles P wave
represents the spread of excitation throught the ventricular myocardium resulting in depolarization of ventricular muscle QRS complex
atrial repolarization is masked by the large QRS deflection
represents the repolarization of the ventricles T wave
represents the interval between the activation of the SA node and the AV node P-R interval
represents the interval between atrial depolarization and ventricular depolarization P-R segment
represents the interval between the end of the S wabe and the start of the T wave, ventricles are uniformly excited S-T segment
represents the interval of time between successive cycles R-R interval
flattened T wave= heart muscle is ischemic
enlarged ST segment= acute myocardial infarctions
enlarged R= enlarged ventricles
Created by: JohnPink



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:
restart all cards