Flashcards in Cardiology I Deck (135)
What controls the opening and closing of the heart valves?
What occurs during ventricular systole?
Contraction of the ventricles which sends blood to the body and lungs.
What occurs during ventricular diastole?
Relaxation of the ventricles which allows them to refill
What are the two left coronary arteries?
Anterior descending and circumflex arteries
What part of the heart does the circumflex artery supply?
It supplies the left and around the back of the heart
What is the right coronary artery?
Posterior interventricular artery
What vein does the heart empty into (coronary)?
The great coronary vein.
The vein that filters the heart is called the _____ and it empties into the _______.
Great coronary vein; right atrium.
What is the blood flow through the heart?
______ is the contraction of the ventricles.
______ is the period in which the ventricles fill with blood from the atria.
What is the time of one contraction & one relaxation?
What is the length of one cardiac cycle?
Approx. 0.8 seconds
What is the length of systole?
Approx. 0.2 seconds
What is the length of diastole?
Approx. 0.52 seconds
_____ is the measurement of the amounts of blood pumped out the ventricles.
Ejection fraction is the measurement of the amounts of what?
Blood pumped out the ventricles.
What is the normal value of ejection fraction?
What part of the cardiac cycle lasts approximately 0.2 seconds?
What part of the cardiac cycle lasts for approximately 0.52 seconds
What lasts approximately 0.8 seconds?
One cardiac cycle
______ is the amount of blood pumped out of ventricles in a single beat.
___ is the pressure in the ventricles at the end of diastole.
What is preload?
The amount of pressure at the end of diastole.
Preload is directly affected by the volume of blood that what?
Returns to the right atrium
_____ is the resistance against which the heart must pump against.
Afterload is what?
The resistance against which the heart must pump against.
What law deals with the stretching of the myocardia?
What does Sterling's law state?
The myocardium can be stretched and will return to its normal state, but if overworked (stretched too far) it will lose its ability to return to its normal state.