Connect Ch. 20 Flashcards
The coronary blood vessels are part of the __________ circuit of the circulatory system.
cardiac
pulmonary
systematic
systemic
cardiovascular
systemic
The circulatory route from the aorta to the venae cavae is the __________ circuit.
systemic
The left and right regions of the heart pump at the same time. The right side of the heart pumps to the __________ and the left side of the heart pumps to the __________.
lungs; body
body; lungs
heart; lungs
body; heart
lungs; body
The outermost layer of the heart wall is known as the __________.
pericardial sac
epicardium
parietal layer of the serous pericardium
myocardium
endocardium
epicardium
The circumflex branch of the left coronary artery travels in a groove called the __________ sulcus.
coronary
The ear-like extension that covers the left atrium is called the left __________.
auricle
ventricle
pulmonary vein
semilunar valve
auricle
To get from the right atrium to the right ventricle, blood flows through the right AV valve, which is also known as the __________ valve.
pulmonary
tricuspid
bicuspid
aortic
mitral
tricuspid
The __________ prevent the AV valves from bulging into the atria during ventricular systole.
tendinous cords
pectinate muscles
trabeculae carneae
AV nodes
cusps
tendinous cords
A myocardial infarction of the right ventricle could be caused by a blockage in the __________.
left marginal branch
posterior interventricular artery
left coronary artery
circumflex branch
posterior interventricular artery
The myocardium receives oxygen and nutrients from __________.
the coronary circulation
the blood in the chambers
the pulmonary circulation
the coronary circulation
Collateral circulation of blood to the heart is established due to the presence of __________, which provide an alternate route for blood flow.
anastamoses
infarctions
thrombi
aneurysms
anastamoses
The __________ nerves innervate the heart and tend to reduce the heart rate.
vagus
Cardiac nerves carry signals from the __________ system to the heart.
sympathetic
parasympathetic
somatic
sympathetic
Ventricular systole begins during the recording of the __________ of the ECG.
QRS complex
P wave
T wave
repolarization
QRS complex
The fetal structure of the ductus arteriosus becomes constricted and forms the __________ two to four days after birth.
foramen arteriosum
ductus ligamentum
aortic shunt
ligamentum arteriosum
ligamentum arteriosum
Beginning 10 to 15 hours after birth, the ductus arteriosus begins to close and becomes the __________.
ligamentum arteriosum
fossa ovalis
truncus arteriosus
bulbus cordis
ligamentum arteriosum
As the heart ages, which chamber is most likely to experience hypertrophy?
Right atrium
Right ventricle
Left atrium
Left ventricle
Left ventricle
The AV valves close in response to the ________________________.
contraction of the atria and the resulting drop in atrial pressure
contraction of the ventricles and the resulting drop in ventricular pressure
contraction of the ventricles and the resulting rise in ventricular pressure
contraction of the atria and the resulting rise in atrial pressure
contraction of the ventricles and the resulting rise in ventricular pressure
Action potentials received directly from ________________ stimulate the papillary muscles to contract, allowing for the proper _______________ of the AV valves.
AV node; closing
subendocardial conducting network (Purkinje fibers); closing
AV node; opening
subendocardial conducting network (Purkinje fibers); opening
subendocardial conducting network (Purkinje fibers); closing
Mitral valve prolapse severe enough to cause regurgitation may directly cause _________________ pressure in the ____________ atrium.
increased; right
increased; left
decreased; left
decreased; right
increased; left
A first degree block is caused by ________________.
delay of the action potential between the SA and AV nodes
delay of the action potential between the SA node and subendocardial conducting network (Purkinje fibers)
delay of the action potential between the AV node and the subendocardial conducting network (Purkinje fibers)
delay of the action potential between the AV and SA nodes
delay of the action potential between the SA and AV nodes
The rate of ventricular conduction is best determined by the _______________________ on an ECG.
the number of P waves present within a specific unit of time
the number of T waves present within a specific unit of time
the number of QRS complexes present within a specific unit of time
the number of QRS complexes present within a specific unit of time
An ECG tracing from someone with a third-degree AV block is best described as a tracing with a ______________________.
2:1 ratio of P waves to QRS complexes
1:1 ratio of P waves to QRS complexes
1:2 ratio of P waves to QRS complexes
1:1 ratio of T waves to QRS complexes
2:1 ratio of P waves to QRS complexes
Which chamber makes up the apex of the heart?
The left atrium
The left ventricle
The right auricle
The right atrium
The right ventricle
The left ventricle
