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 QRS is just starting
C.
the ventricles are in systole
D.
blood is forced into the veins
Question #2
Which event results in the first heart sound?
A.
the AV valves open
B.
the semilunar valves open
C.
the semilunar valves close
D.
the AV valves close
Question #3
According to the Frank-Starling law of the heart, the cardiac output is directly related to the:
A.
myocardium thickness
B.
heart rate
C.
venous return
D.
end-diastolic volume
Question #4
Stretching a myocardial cell:
A.
only allows more calcium to enter
B.
only increases the force of contraction
C.
allows more calcium to enter and increase the force of contraction
D.
only decreases the force of a contraction
Question #5
The P wave of an ECG corresponds to:
A.
the progressive wave of ventricular depolarization
B.
repolarization of the ventricles
C.
repolarization of the atria
D.
depolarization of the atria
Question #6
If (funny) channels are permeable to:
A.
sodium only
B.
potassium only
C.
sodium and potassium
D.
calcium only
Question #7
Autorhythmic cells:
A.
contribute to the force of contraction
B.
are the same size as myocardial contractile cells
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 sodium
B.
both calcium and potassium
C.
only potassium
D.
only calcium
Question #9
Which electrical event happens at the start of a cardiac cycle?
A.
the SA node fires
B.
the P wave develops
C.
blood is ejected from the atrium
D.
ventricular systole occurs
Question #10
The cardiac output is equal to the:
A.
product of heart rate and stroke volume
B.
difference between the end0diastolic volume and end-systolic volume
C.
blood stored within the veins
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.
cardiac output (CO)
B.
heart rate (HR)
C.
end-systolic volume (ESV)
D.
end-diastolic volume (EDV)
Question #12
Autorhythmic cells can generate action potentials spontaneously because they have:
A.
sodium and potassium channels are always open
B.
prolonged calcium influx
C.
a net influx of sodium
D.
unstable membrane potentials
Question #13
Acetylcholine slows the heart rate by:
A.
increasing the permeability to K+ and decreasing the permeability to Ca2+
B.
increasing 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.
end-systolic volume (ESV)
B.
end-diastolic volume (EDV)
C.
cardiac output (CO)
D.
stroke volume (SV)
Question #15
The fibrous skeleton of the heart is important because it:
A.
transmits electrical activity from the atria to the ventricles
B.
forces electrical activity to be conducted through the atrioventricular node
C.
helps guide the blood into the proper chambers in sequence
D.
directs the flow of blood into the arteries
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.
TRUE
B.
FALSE
Question #17
During the cardiac cycle:
A.
the P wave of the ECG occurs between the first and third heart sounds
B.
the QRS complex of the ECG comes before the increase in ventricular pressure
C.
the greatest increase in ventricular pressure occurs during the filling phase
D.
the second heart sound is recorded as the QRS complex of the ECG
Question #18
The chambers of the heart that pump blood enters into from the veins are the _____.
A.
Atrium
B.
semilunar valves
C.
AV valves
D.
SA node
Question #19
Ventricular contraction begins:
A.
during the first part of the P wave
B.
just after the Q wave
C.
just after the T wave
D.
during the ST segment
Question #20
Stimulation of the beta receptors on heart muscle results in:
A.
increased contractile strength
B.
increased sensitivity to acetylcholine
C.
decreased rate of contraction
D.
decreased force of contraction
Question #21
During ventricular systole,
A.
the atria are contracting
B.
the pressure in the ventricles declines
C.
the AV valves are closed
D.
blood is entering the ventricles
Question #22
The muscle layer of the heart wall is the _____.
A.
Atrium
B.
myocardium
C.
Autorhythmic cells
D.
sarcomeres
Question #23
In order for blood to enter the heart,
A.
the atria must be in diastole
B.
the ventricles must be completely empty
C.
the AV valves must be open
D.
the atria must be in diastole but the atrial pressure must be lower than the veins
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, decreasing
B.
increasing, decreasing
C.
increasing, increasing
D.
decreasing, increasing
Question #25
ECGs:
A.
measure the mechanical activity of the heart
B.
show the summed electrical activity generated by all cells of the heart
C.
provide direct information about heart function
D.
are used to diagnose heart murmurs
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