Heart Quiz
Which network of specialized cardiac muscle fibers provide a path for each cycle of cardiac excitation to progress through the heart?
Cardiac conduction system
Blood flows through the right coronary artery (RCA) to the anterior interventricular and circumflex branches.
False
Blood, or any other liquid, flows from an area of low pressure to an area of high pressure.
False
The purpose of the chordae tendinae is to open and close the atrioventricular valves.
False
The right ventricle has a thicker wall than the left ventricle, because of its heavier work load.
False
Which of the following describe the relaxation period of the cardiac cycle?
It is a time that becomes shorter as the heart rate increases.
Which of the following correctly lists the sequence of structures that a cardiac action potential follows in order to excite normal contraction of the heart?
SA node, AV node, Bundle of His, Purkinje fibers
The second heart sound (dupp) closely follows which of the events listed below?
Semilunar valves closing
Represents time when ventricles are repolarizing
T wave
Why doesn't a significant amount of blood flow back into the vena cavae and coronary sinus during atrial contraction?
the contraction of the atria compresses and closes the venous openings
The right coronary artery does NOT supply blood to
the left atrium
Why is the myocardium of the left ventricle thicker than the myocardium of the right ventricle?
the left ventricle has to overcome a greater peripheral resistance
Isovolumetric contraction is the phase of the cardiac cardiac cycle in which
ventricular pressure increases and ventricular volume remains the same.
Put the following structures in the correct order of blood flow, starting with venous blood entering the heart through the superior and inferior vena cavae.
1 right atrium 2 right ventricle 3 pulmonary trunk and arteries 4 pulmonary capillaries 5 pulmonary veins 6 left atrium 7 left ventricle 8 aorta and systemic arteries
The only site where action potentials conduct from the atria to the ventricles is the
AV bundle (Bundle of His)
Arteries always conduct blood away from the heart, while veins conduct blood towards the heart.
True
Because the output of one blood flow circuit becomes the input of the other, the two sides of the heart contract simultaneously and eject the same volume of blood.
True
Cardiac tamponade results from accumulation of fluid within the pericardial cavity
True
Compression of the endomyocardial arteries during ventricular contraction causes blood to flow through the coronary circulation ONLY during ventricular relaxation.
True
The heart chambers must be filled before contracting, so correct timing (atria followed by ventricles) is critical for efficient pumping.
True
The serous pericardium is divided into an outer parietal layer and an inner visceral layer, which is adhered to the surface of the heart.
True
In comparison to a sedentary individual, a well-trained athlete will usually have all the following characteristics EXCEPT
a higher resting cardiac output.
Which of the following is FALSE?
b. The plateau period in contractile myocardial cells results from the entry of K+ into the cells
The left atrioventricular valve is also known as the ___________ valve.
bicuspid
Which of the following is TRUE?
c. The intrinsic rate of depolarization of the SA node can be modified by the autonomic nervous system
Choose the CORRECT statement.
c. The right atrium receives deoxygenated blood from the venous circulation
The amount of blood contained in a ventricle at the end of atrial systole is the
end-diastolic volume
Each of the cardiac valves
ensures one-way blood flow through the heart.
Cardiac muscle tissue is characterized by all of these EXCEPT:
multinucleated cells
Cardiac muscle cells
none of the above are true
Which of the structures below is held closed during ventricular diastole by back flow of blood coming from the lungs?
pulmonary SL valve
Which of the following is NOT a vessel entering the right atrium?
pulmonary vein
Waste filled blood from cardiac muscle itself enters the __________________ chamber of the heart through which vessel?
right atrium; coronary sinus