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WorksheetsBIO124 Chapter 19
Total questions: 25
Worksheet time: 8mins
The heart beats approximately ________ times each day.
1,000,000
100,000
1,000
10,000
The structure that permits blood flow from the right atrium to the left atrium in the fetal circulation is the
foramen ovale.
coronary sinus.
ligamentum arteriosus.
ductus arteriosis.
The atrioventricular valves permit blood flow
in one direction.
from a ventricle to an atrium.
in many directions.
in both directions.
In the middle of the thoracic cavity is a region occupied by the heart, great vessels, thymus, esophagus, and trachea called the
cardiac notch.
ventral cavity.
mediastinum.
pleural space.
Contractions of the papillary muscles
close the semilunar valves.
prevent the atrioventricular valves from reversing into the atria.
eject blood from the ventricles.
eject blood from the atria into the ventricles.
As blood leaves the right ventricle, it passes through the ________ and then into the pulmonary trunk.
conus arteriosus
pulmonary veins
aorta
papillary muscles
Which of the following are involved in the pulmonary circuit?
right ventricle, pulmonary trunk, left atrium
right ventricle, pulmonary veins, aorta
superior vena cava, right atrium, left ventricle
left ventricle, pulmonary veins, right atrium
The great and middle cardiac veins drain blood into the
aorta.
coronary sinus.
inferior vena cava.
superior vena cava.
The ________ covers the outer surface of the heart.
parietal pericardium
endocardium
myocardium
epicardium
The normal pacemaker of the heart is located in
the sinoatrial node.
the atrioventricular node.
the Purkinje fibers.
the wall of the left ventricle.
Depolarization of the ventricles is represented on an electrocardiogram by the
P wave.
QRS complex.
S wave.
T wave.
The T wave on an ECG tracing represents
atrial depolarization.
atrial repolarization.
ventricular depolarization.
ventricular repolarization.
________ is to slow heart rate as ________ is to fast heart rate.
Tachycardia; bradycardia
Bradycardia; tachycardia
Angina; infarction
Bradycardia; cardiomyopathy
The property of heart muscle to contract in the absence of neural or hormonal stimulation is called
automaticity.
autonomic.
self-starting.
contraction.
Which of the following describes what is directly measured by an ECG?
the force of contractions
end-diastolic volume
end-systolic volume
electrical conduction
The basic heartrate established by the SA node is called the
pacemaker potential.
SA potential.
action potential.
sinus rhythm.
During ventricular systole, the
atria are contracting.
blood is entering the ventricles.
AV valves are closed.
pressure in the aorta remains constant.
The contraction phase of the cardiac cycle is called
systole.
cardiomyopathy.
diastole.
depolarization.
The backward flow of blood from a ventricle to its atrium or from a outflow vessel to its ventricle is called
regurgitation.
stenosis.
thrombosis.
fibrillation.
The ________ is the volume of blood in a ventricle at the beginning of systole.
ejection fraction
end-diastole volume
end-systolic volume
stroke volume
The amount of blood remaining in the ventricle when the semilunar valve closes is the
ejection fraction.
end-diastole volume.
end-systolic volume.
stroke volume.
The heart spends most of the cardiac cycle in which phase?
atrial systole
atrial diastole
ventricular systole
ventricular diastole
The volume of blood ejected from each ventricle during a contraction is called the
cardiac output.
end-diastolic volume.
end-systolic volume.
stroke volume.
Heart rate is controlled by neurons of the cardiovascular center located in the
medulla oblongata.
pons.
thalamus.
hypothalamus.
Cardiac output is increased by
sympathetic stimulation.
increased end systolic volume.
decreased end diastolic volume.
decreased stroke volume.
