Bio 224A cardio pt1 and 2 quiz Flashcards
The right ventricle of the heart acts as a pump for the
pulmonary circulation
Which valve regulates blood flow into the pulmonary trunk?
Pulmonic
Which structure is directly attached to the right and left atrioventricular valves?
Chordea tendinea
The right atrioventricular valve is also called the:
tricuspid.
Respectively, the right and left atrioventricular valves are also known as:
tricuspid, mitral.
Which of the following is not true of the ventricles?
-the myocardium of the left ventricle is thicker than that of the right ventricle.
-All of the above are true of ventricles.
-The myocardium of the ventricles is thicker than that of the atria.
-They are the pumping chambers of the heart.
All of the above are true of ventericles
Match the great vessel with the heart chamber to which it is attached:
Left atrium
right atrium
left ventericle
right ventricle
Pulmonary veins
vena cavae
aorta
pulmonary trunk
Contraction of a ventricular chamber is called
systole
What is the primary pacemaker of the heart?
Sinoatrial (SA) node
Influx of which electrolyte is responsible for the plateau phase of the action potential in cardiac contractile cells?
Calcium (Ca2+)
The volume of blood ejected from the left ventricle during a single systolic contraction is called the _____________.
stroke volume
During ventricular filling, the mitral valve is ___ while the aortic valve is ____
open, close
In a normal EKG tracing, the T-wave corresponds to _______________.
ventricular repolarization
In the contractile cardiac cell, which channels are primarily responsible for repolarization?
potassium (K+) channels
Which plasma membrane structures join the cytoplasms of adjacent cardiac myocytes, thereby allowing them to communicate with each other?
gap junctions
