anatomy worksheet 7

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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


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