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