Lab #5 Information Quiz Flashcards
What test is used to measure the electrical activity of the heart?
electrocardiogram
What structures in heart muscle allows action potential from the heart’s conduction system to spread through the cardiac muscle fibers?
Intercalated discs
During the cardiac cycle, which valves open when the ventricles contract?
pulmonary semilunar valves and aortic semilunar valves
During a cardiac cycle, when the ventricles fill with blood, which valves close?
Atrioventricular valves (AV Valves)
A pause in the electrical impulse transmission of the heart occurs at the
atrioventricular node(AV node)
Electrical impulses of the heart are initiated at the
sinoatrial node (SA Node)
The amount of blood pumped out of the heart in one cardiac cycle:
Stroke volume
The difference between an individuals resting cardiac output and their maximum cardiac output is called:
cardiac reserve
Ventricular relaxation and expansion is known as the:
diastole
Blood leaves the heart to enter the systematic circulation through which structure?
Aorta
Ventricular contraction and constriction is known as
systole
The bundle of HIS divides into what structure?
Right and left BUNDLE BRANCHES.
Which cells compose the myocardium?
Cardiomyocytes
(Heart muscle cells)
Oxygenated blood from the lungs enters the heart at the:
Left atrium-pulmonary veins enter the heart through the left atrium.
The amount of blood pumped by the heart in one minute is called:
cardiac output