Which statement concerning the pulmonary arteries is FALSE?
The right ventricle pumps blood into the pulmonary arteries.
The pulmonary arteries carry oxygenated blood back from the lungs to the heart.
The pulmonary arteries are part of the pulmonary circuit.
The pulmonary arteries carry poorly oxygenated blood.
answer
False: The pulmonary arteries carry oxygenated blood back from the lungs to the heart.
The pulmonary veins carry oxygenated blood back to the heart from the lungs. Arteries bring blood AWAY the heart.
question
The term that describes the relaxation of a heart chamber wall as it fills with blood is__________ .
answer
diastole
question
Which of the following vessels does not carry oxygen-poor blood to the heart?
the pulmonary vein
the coronary sinus
the inferior vena cava
the superior vena cava
answer
the pulmonary vein
question
Which vessel returns most of the venous blood from the heart to the right atrium?
the coronary sinus
the anterior cardiac vein
the great cardiac vein
the posterior interventricular vein
answer
the coronary sinus
question
During ventricular systole, blood is
forced from the ventricles into the aorta and pulmonary trunk.
forced from the atria into the ventricles.
not flowing into or out of the heart.
flowing from the systemic and pulmonary circuits into both the atria and ventricles.
answer
forced from the ventricles into the aorta and pulmonary trunk.
question
In common usage, the terms "systole" and "diastole" refer to __________, respectively.
ventricular contraction and ventricular filling
the effects of myocardial infarction and pulmonary hypertension
ventricular fibrillation and atrial fibrillation
ventricular filling and ventricular contraction
answer
ventricular contraction and ventricular filling
question
Assume blood is flowing from the coronary sinus to the lung capillaries. Place the anatomical items in order of flow in the target boxes.
answer
Capillaries of Lungs >Coronary Sinus > Right Atrium > Tricuspid Valve > Right Ventricle > Pulmonary Semilunar Valve > Pulmonary Trunk > Pulmonary Arteries > Capillaries of Lungs
Select the correct partial path below. This path is part of the complete blood flow pathway. You should be able to trace flow starting in any location.
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Select the correct partial path below. This path is part of the complete blood flow pathway. You should be able to trace flow starting in any location.
Systemic veins returning to the left atrium and forward through the mitral valve.
Aorta to smaller systemic arteries to systemic capillaries to systemic veins to right atrium through the tricuspid valve
Pulmonary trunk to pulmonary arteries to pulmonary capillaries to pulmonary veins returning to the right atrium.
Pulmonary artery into left atrium through mitral valve to left ventricle
Previous Answers
Correct
All systemic veins return oxygen-poor venous flow to the right atrium, through the tricuspid to the right ventricle, and up and out the pulmonary semilunar valve to the pulmonary trunk and pulmonary arteries to the capillaries of the lungs.
Returning oxygen-rich blood flowing through pulmonary veins enters the left atrium, passes through the mitral valve to the left ventricle, and out through the aortic semilunar valve into the aorta and on to systemic capillaries.
answer
Aorta to smaller systemic arteries to systemic capillaries to systemic veins to right atrium through the tricuspid valve
question
Which of these conduction sequences through the heart is correct?
Which of these conduction sequences through the heart is correct?
SA node, AV bundle, AV node, Purkinje fibers, bundle branches
SA node, AV node, AV bundle, Purkinje fibers, bundle branches
AV node, Purkinje fibers, AV bundle, SA node, bundle branches
AV bundle, AV node, SA node, Purkinje fibers, bundle branches
SA node, AV node, AV bundle, bundle branches, Purkinje fibers
answer
SA node, AV node, AV bundle, bundle branches, Purkinje fibers
question
The atrioventricular node is located in the
right atrium, just inferior to the opening of the superior vena cava.
inferior part of the interatrial septum.
interventricular septum, near the heart base.
walls of the ventricles, with the other Purkinje fibers.
answer
inferior part of the interatrial septum.
question
Identify the vessel that returns most of the blood from the heart into the right atrium.
coronary sinus
great cardiac vein
superior vena cava
coronary sulcus
answer
coronary sinus
The majority of veins that drain the heart empty into the coronary sinus.
question
The right and left coronary arteries __________.
branch from the aortic arch
supply blood to the pericardial sac
supply blood to the heart muscle itself
drain into the right atrium
drain into the coronary sinus
answer
supply blood to the heart muscle itself
question
A specific coronary vessel that lies in the anterior interventricular sulcus is the
middle cardiac vein.
coronary sinus.
anterior interventricular artery/Left anterior descending artery (LAD).
circumflex artery.
Serous fluid in the pericardial cavity __________.
is secreted by the heart itself
increases friction between the beating heart and the outer wall of the pericardial sac
is a remnant of embryonic development
is a slippery fluid secreted by the fibrous pericardium
is secreted by the epithelial cells of both layers of the serous pericardium
answer
is secreted by the epithelial cells of both layers of the serous pericardium
question
The__________ layer of the serous pericardium is also known as the epicardium.
answer
visceral
question
The semilunar valves prevent backflow of blood into the _____.
ventricles
vena cavae
lungs
atria
answer
ventricles
Correct. The pulmonary valve prevents backflow into the right ventricle; the aortic valve prevents backflow into the left ventricle.
question
Which vessel carries oxygenated blood?
pulmonary trunk
pulmonary vein
superior vena cava
pulmonary artery
answer
pulmonary vein
question
Which structure anchors the chordae tendinae of the atrioventricular valves?
papillary muscle
trabeculae carnea
interventricular septum
pectinate muscle
answer
papillary muscle
The papillary muscles are extensions from the ventricular wall that connect to the chordae tendinae. Upon ventricular contraction, the papillary muscles contract to prevent the atrioventricular valves from everting into the atria.
question
Which layer of the heart wall is visceral pericardium?
epicardium
endothelium
myocardium
endocardium
answer
epicardium
question
Which heart chamber has the thickest myocardium?
the left atrium, because blood returned from the lungs has a high pressure
the right atrium, because it receives a greater amount of blood from the systemic veins
the right ventricle, because it pumps poorly oxygenated blood
the left ventricle, because it pumps blood at a higher pressure
answer
the left ventricle, because it pumps blood at a higher pressure
The thick ventricular wall enables the left ventricle to pump blood at a much higher pressure than the right ventricle.
question
Irregular ridges of muscle called trabeculae carneae are located within the walls of the__________ .
answer
ventricle
question
The auricles are
earlike flaps on the surface of the atria.
modifications of the pectinate muscles on the inner surface of the atria.
earlike flaps on the surface of the ventricles.
projections of the endothelium into the ventricles.
answer
earlike flaps on the surface of the atria.
question
The fibrous skeleton of the heart functions in all of these ways EXCEPT in __________.
lining the heart chambers, covering the heart valves, and forming the ridge of the crista terminalis
causing direct spread of electrical impulses from the atria to the ventricles
anchoring the valve cusps
preventing overdilation of the valve openings
acting as the point of insertion for bundles of cardiac muscle in the atria and ventricles
answer
causing direct spread of electrical impulses from the atria to the ventricles
question
When the ventricles relax, intraventricular pressure falls and __________.
blood is pushed against the AV valves, causing them to open
blood is pushed against the AV valves, causing them to close
both the AV valves and semilunar valves are closed
blood is pushed against the semilunar valves, causing them to close
blood is pushed against the semilunar valves, causing them to open
answer
blood is pushed against the semilunar valves, causing them to close
question
What is the function of the chordae tendineae and papillary muscles of the bicuspid and tricuspid valves?
forcing closure of the semilunar valves
preventing reflux (regurgitation) of atrial blood into the ventricles
preventing eversion of the valves into the atria
preventing reflux (regurgitation) of ventricular blood into the pulmonary trunk
preventing reflux (regurgitation) of ventricular blood into the aorta
opening the semilunar valves
answer
preventing eversion of the valves into the atria
question
Heart valve with two cusps.
fossa ovalis
pulmonary semilunar valve
aortic semilunar valve
mitral valve
atrioventricular bundle
answer
mitral valve
question
Semilunar valves are located
between the great veins and the atria.
only between the left ventricle and the aorta.
between the ventricles and the great arteries.
between the atria and the ventricles
answer
between the ventricles and the great arteries.
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