Biol 362 - Mammalian Physiology » Fall 2021 » Quiz 4
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Question #1
During ventricular ejection,
A.
the semilunar valves are closed
B.
the ventricles are in systole
C.
blood is forced into the veins
D.
the QRS is just starting
Question #2
Which event results in the first heart sound?
A.
the AV valves open
B.
the semilunar valves close
C.
the AV valves close
D.
the semilunar valves open
Question #3
According to the Frank-Starling law of the heart, the cardiac output is directly related to the:
A.
end-diastolic volume
B.
heart rate
C.
myocardium thickness
D.
venous return
Question #4
Stretching a myocardial cell:
A.
only decreases the force of a contraction
B.
only increases the force of contraction
C.
allows more calcium to enter and increase the force of contraction
D.
only allows more calcium to enter
Question #5
The P wave of an ECG corresponds to:
A.
the progressive wave of ventricular depolarization
B.
repolarization of the ventricles
C.
depolarization of the atria
D.
repolarization of the atria
Question #6
If (funny) channels are permeable to:
A.
sodium and potassium
B.
potassium only
C.
calcium only
D.
sodium only
Question #7
Autorhythmic cells:
A.
are the same size as myocardial contractile cells
B.
contribute to the force of contraction
C.
are also called pacemakers because they set the rate of the heartbeat
D.
have organized sarcomeres
Question #8
During the plateau phase of the action potentials of myocardial contractile cells, which ion(s) is/are crossing the membrane?
A.
only potassium
B.
only calcium
C.
only sodium
D.
both calcium and potassium
Question #9
Which electrical event happens at the start of a cardiac cycle?
A.
ventricular systole occurs
B.
the P wave develops
C.
blood is ejected from the atrium
D.
the SA node fires
Question #10
The cardiac output is equal to the:
A.
blood stored within the veins
B.
difference between the end0diastolic volume and end-systolic volume
C.
product of heart rate and stroke volume
D.
stroke volume minus the end-systolic volume
Question #11
The term used to describe the amount of blood in the ventricle available to be pumped out of the heart during the next contraction is:
A.
end-diastolic volume (EDV)
B.
end-systolic volume (ESV)
C.
cardiac output (CO)
D.
heart rate (HR)
Question #12
Autorhythmic cells can generate action potentials spontaneously because they have:
A.
unstable membrane potentials
B.
sodium and potassium channels are always open
C.
a net influx of sodium
D.
prolonged calcium influx
Question #13
Acetylcholine slows the heart rate by:
A.
increasing the permeability to Ca2+
B.
increasing the permeability to K+ and decreasing the permeability to Ca2+
C.
acetylcholine does not act on the heart
D.
increasing ion influx, thus increasing the rate of depolarization
Question #14
The volume of blood ejected from each ventricle during a contraction is called the:
A.
cardiac output (CO)
B.
end-diastolic volume (EDV)
C.
end-systolic volume (ESV)
D.
stroke volume (SV)
Question #15
The fibrous skeleton of the heart is important because it:
A.
forces electrical activity to be conducted through the atrioventricular node
B.
directs the flow of blood into the arteries
C.
helps guide the blood into the proper chambers in sequence
D.
transmits electrical activity from the atria to the ventricles
Question #16
The rule that states "Within physiological limits, the heart pumps all of the blood that returns to it" is known as the Frank-Starling Law of the Heart."
A.
FALSE
B.
TRUE
Question #17
During the cardiac cycle:
A.
the QRS complex of the ECG comes before the increase in ventricular pressure
B.
the greatest increase in ventricular pressure occurs during the filling phase
C.
the second heart sound is recorded as the QRS complex of the ECG
D.
the P wave of the ECG occurs between the first and third heart sounds
Question #18
The chambers of the heart that pump blood enters into from the veins are the _____.
A.
semilunar valves
B.
AV valves
C.
SA node
D.
Atrium
Question #19
Ventricular contraction begins:
A.
just after the T wave
B.
during the ST segment
C.
just after the Q wave
D.
during the first part of the P wave
Question #20
Stimulation of the beta receptors on heart muscle results in:
A.
decreased rate of contraction
B.
decreased force of contraction
C.
increased contractile strength
D.
increased sensitivity to acetylcholine
Question #21
During ventricular systole,
A.
the AV valves are closed
B.
blood is entering the ventricles
C.
the pressure in the ventricles declines
D.
the atria are contracting
Question #22
The muscle layer of the heart wall is the _____.
A.
myocardium
B.
sarcomeres
C.
Autorhythmic cells
D.
Atrium
Question #23
In order for blood to enter the heart,
A.
the ventricles must be completely empty
B.
the AV valves must be open
C.
the atria must be in diastole but the atrial pressure must be lower than the veins
D.
the atria must be in diastole
Question #24
The flattening of the action potentials of myocardial contractile cells, called the plateau phase, is due to a combination of _____ K+ permeability and _____ Ca2+ permeability.
A.
decreasing, increasing
B.
increasing, increasing
C.
increasing, decreasing
D.
decreasing, decreasing
Question #25
ECGs:
A.
measure the mechanical activity of the heart
B.
are used to diagnose heart murmurs
C.
show the summed electrical activity generated by all cells of the heart
D.
provide direct information about heart function
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