anatomy worksheet 7
the average heart beats about __ times per minute
75
the first heart sound. "lub" is caused by the closure of the ____ valves
atrioventricular (AV)
what part if the heart's intrinsic conduction system carries impulses into the interventricular septum?
atrioventricular (AV) bundle
where does the sinoatrial node send an impulse after it initiates the electrical signal?
atrioventricular (AV) node
the heart sounds result from
closure of heart valves
when ventricles ___ the AV valves are closed
contract
pressure in the ventricles is low
diastole
ventricular relaxation
diastole
the heart sounds "lub" and "dub" occur when the atria contract and subsequently when the ventricles contract
false
which of these events is NOT associated with ventricular systole
heart is relaxed
the sinoatrial node, located in the right atrium of the heart, is often called the
pacemaker
the sinoatrial node is located in the
right atrium
which one of the following represents the correct path for the transmission of an impulse in the intrinsic conduction system of the heart?
sinoatrial (SA) node, atrioventricular (AV) bundle (bundle of His), right and left bundle branches, Purkinje fibers
atrioventricular (AV) valves shut as the pressure in the heart rises
systole
blood is ejected from the ventricles through the pulmonary trunk and aorta
systole
semilunar valves are forced to open as pressure in the heart rises
systole
ventricular contraction
systole
what term refers to the contraction of the heart?
systole
during ventricular systole, blood is ejected from the ventricles through the large arteries connected to the heart
true
the average heart beats approximately 75 times each minute at rest
true
the part of the intrinsic conduction system of the heart that directly supplies the walls of the ventricles is the Purkinje fibers
true
the sinoatrial (SA) node is the pacemaker of the intrinsic conduction system of the heart?
true
during mid-to-late diastole, blood flows from the atria to the
ventricles