Results and stats for "Heart physiology"
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Average score: 36.8
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Total plays: 5
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Related quizzes
Most correctly guessed answers
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What is the function of the SA node of the heart?
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Pacemaker tissue
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100.0%
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What effect does the vagus nerve have on the contractions of the SA node of the heart?
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Slows them down
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100.0%
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An artery carries blood [...] from the heart.
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away
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100.0%
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A vein carries blood [...] the heart.
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towards
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100.0%
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The flow out of the heart per minute is called the [...].
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cardiac output
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100.0%
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The parasympathetic nervous system [...]creases heart rate.
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de
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100.0%
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The sympathetic nervous system [...]creases heart rate.
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in
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100.0%
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The sympathetic nervous system [...]creases the force of contraction of the heart.
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in
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100.0%
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Do the sympathetic and parasympathetic nervous systems have a reciprocal effect on heart rate?
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Yes
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100.0%
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Why does venous pooling occur when standing still but not when walking?
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When walking, skeletal muscle pumping helps to return blood to the heart
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100.0%
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Is maximum heart rate dependent on fitness level?
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No
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100.0%
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Is maximum heart rate dependent on age?
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Yes
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100.0%
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Does the increase in cardiac output during exercise due to an increased heart rate or stroke volume?
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Both, but mostly heart rate
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100.0%
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Why is it important for the AV node of the heart to contract more slowly than the SA node?
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Allows the atria to empty their blood into the ventricles before the ventricles contract
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80.0%
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The flow into the heart per minute is called the [...].
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venous return
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80.0%
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Conduction velocity in the AV node of the heart is [...]ted by the vagus nerve.
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inhibi
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80.0%
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The atria of the heart contract [...]wards while the ventricles contract [...]wards.
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down, wards, up, wards
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80.0%
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Systole specifically refers to the contraction of the heart's [...].
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left ventricle
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80.0%
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What is meant by something having an inotropic effect on the heart?
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Increases the force of contraction
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80.0%
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What is meant by something having a chronotropic effect on the heart?
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Increases the frequency of contraction
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80.0%
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What is the S1 heart sound caused by?
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Closure of AV valves (tricuspid and mitral)
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80.0%
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What is the S2 heart sound caused by?
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Closure of semilunar valves (pulmonary and aortic)
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80.0%
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The parasympathetic nervous system acts on the heart through [...]ic receptors.
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muscarin
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80.0%
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What is the Frank-Starling law of the heart?
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Stroke volume increases in response to an increase in end-diastolic pressure
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80.0%
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The [...] states that stroke volume increases in response to an increase in end-diastolic pressure.
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Frank-Starling law of the heart
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80.0%
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Why is it important that the heart follow Starling's law?
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Matches left and right stroke volumes
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80.0%
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Noradrenaline [...]creases heart rate.
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in
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80.0%
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Acetylcholine [...]creases heart rate.
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de
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80.0%
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The [...] is the fraction of the blood in the heart which is ejected during systole.
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ejection fraction
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80.0%
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The jugular venous pulse reflects the pressure in which chamber of the heart?
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Right atrium
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80.0%
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What is a right to left shunt?
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Blood from some veins goes directly into the left side of the heart and is never oxygenated in the lungs
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80.0%
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The filling of the heart with blood is determined by the [...] pressure.
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central venous
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60.0%
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The pressure load on the left heart is called [...].
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afterload
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60.0%
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The sympathetic nervous system acts on the heart through the [...] receptor.
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β1
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60.0%
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How does oxygen extraction from the blood in the heart compare to other tissues?
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Much higher (70% vs. 25%)
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60.0%
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Why is BP measured at the level of the heart?
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Because BP is affected by gravity (higher BP lower in the body)
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60.0%
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[...] is the normal beating of the heart.
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Sinus rhythm
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60.0%
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In sinus rhythm, does heart rate stay constant?
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No, changes with respiration
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60.0%
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During which phase of breathing is a split S2 heart sound most apparent?
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Inspiration
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60.0%
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The flow out of the heart per heartbeat is called the [...].
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stroke volume
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40.0%
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The filling pressure of the heart is called [...].
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preload
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40.0%
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Vagal tone slows the heart rate from [...] beats per minute to a normal resting heart rate.
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100
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40.0%
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What is the S3 heart sound caused by?
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Opening of AV valves and rapid refilling
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40.0%
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What is the S4 heart sound caused by?
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Atrial systole
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40.0%
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What are the 3 major differences between the action potential of cardiac myocytes in the SA node and those in the rest of the heart?
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Resting potential is more positive
Upstroke is much slower
Resting potential decays spontaneously
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40.0%
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Which phase of the SA node action potential determines heart rate?
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Decay to spike threshold
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40.0%
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Blood pressure in the feet is [...] mmHg higher than at the level of the heart.
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90
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40.0%
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Why are venous pressures above the heart not subatmospheric?
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Because the veins collapse when the pressure falls
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40.0%
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Why can there be a normal split S2 heart sound during inspiration?
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Drop in intrathoracic pressure increases capacity of pulmonary circulation
Pulmonary valve closes later to accomodate more blood in the lungs
Aortic valve closes earlier because of a reduced venous return to the left heart
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40.0%
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At any given time, [...]% of the body's blood is in the heart.
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5
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20.0%
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Activation of atrial volume receptors leads to [...]creased sympathetic tone to the heart and vasculature.
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de
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20.0%
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What is the Treppe effect?
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Heart contractility increases with heart rate
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20.0%
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Afferent sympathetic nerves from the heart travel back to spinal nerves [...]-[...].
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T1, T5
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0.0%
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Why does heart contractility increase with heart rate?
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More Ca2+ is left in the myocyte (less time to remove it between contractions), so produce more force when contracting
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0.0%
