Lab 45: Cardiac Cycle Flashcards
the period during which a heart chamber is contracting is called______
Systole
the period during which a heart chamber is relaxing is called ______
Diastole
during ventricular contraction, the AV valves are ______
Closed
during ventricular relaxation, the AV valves are _______
Open
the pulmonary and aortic valves open when the pressure in the _______ exceeds the pressure in the pulmonary trunk and aorta
Ventricles
the first sound of a cardiac cycle occurs when the ______ are closing.
Av Valves
second sound of a cardiac cycle occurs when the ______ are closing.
Semilunar
the sound created when blood leaks back through an incompletely closed valve is called a _______
Murmur
normally, the _____ node serves as the pacemaker of the heart.
SA
the ________ node is located in the inferior portion of theinteratrial septum
AV
the fibers that carry cardiac impulses front he inter ventricular septum into the myocardium are called _______
Purkinje fibers
a _____ is a recording or electrical changes occurring in the myocardium during a cardiac cycle.
ECG
the P wave corresponds to depolarization of the muscle fibers of the _____
ATRIA
the QRS complex corresponds to depolarization of the muscle fibers of the _______
ventricles
the T wave corresponds to repolarization of the muscle fibers of the ________
Ventricles
