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Related quizzes

Most correctly guessed answers

      • What is the function of the SA node of the heart?
      • Pacemaker tissue
      • 100.0%
      • What effect does the vagus nerve have on the contractions of the SA node of the heart?
      • Slows them down
      • 100.0%
      • An artery carries blood [...] from the heart.
      • away
      • 100.0%
      • A vein carries blood [...] the heart.
      • towards
      • 100.0%
      • The flow out of the heart per minute is called the [...].
      • cardiac output
      • 100.0%
      • The parasympathetic nervous system [...]creases heart rate.
      • de
      • 100.0%
      • The sympathetic nervous system [...]creases heart rate.
      • in
      • 100.0%
      • The sympathetic nervous system [...]creases the force of contraction of the heart.
      • in
      • 100.0%
      • Do the sympathetic and parasympathetic nervous systems have a reciprocal effect on heart rate?
      • Yes
      • 100.0%
      • Conduction velocity in the AV node of the heart is [...]ted by the vagus nerve.
      • inhibi
      • 100.0%
      • Why does venous pooling occur when standing still but not when walking?
      • When walking, skeletal muscle pumping helps to return blood to the heart
      • 100.0%
      • Is maximum heart rate dependent on fitness level?
      • No
      • 100.0%
      • Is maximum heart rate dependent on age?
      • Yes
      • 100.0%
      • Does the increase in cardiac output during exercise due to an increased heart rate or stroke volume?
      • Both, but mostly heart rate
      • 100.0%
      • Why is it important for the AV node of the heart to contract more slowly than the SA node?
      • Allows the atria to empty their blood into the ventricles before the ventricles contract
      • 75.0%
      • The flow into the heart per minute is called the [...].
      • venous return
      • 75.0%
      • The atria of the heart contract [...]wards while the ventricles contract [...]wards.  
      • down, wards, up, wards
      • 75.0%
      • Systole specifically refers to the contraction of the heart's [...].
      • left ventricle
      • 75.0%
      • What is meant by something having an inotropic effect on the heart?
      • Increases the force of contraction
      • 75.0%
      • What is meant by something having a chronotropic effect on the heart?
      • Increases the frequency of contraction
      • 75.0%
      • What is the S1 heart sound caused by?
      • Closure of AV valves (tricuspid and mitral)
      • 75.0%
      • What is the S2 heart sound caused by?
      • Closure of semilunar valves (pulmonary and aortic)
      • 75.0%
      • The parasympathetic nervous system acts on the heart through [...]ic receptors.
      • muscarin
      • 75.0%
      • What is the Frank-Starling law of the heart?
      • Stroke volume increases in response to an increase in end-diastolic pressure
      • 75.0%
      • The [...] states that stroke volume increases in response to an increase in end-diastolic pressure.
      • Frank-Starling law of the heart
      • 75.0%
      • Why is it important that the heart follow Starling's law?
      • Matches left and right stroke volumes
      • 75.0%
      • Noradrenaline [...]creases heart rate.
      • in
      • 75.0%
      • Acetylcholine [...]creases heart rate.
      • de
      • 75.0%
      • The [...] is the fraction of the blood in the heart which is ejected during systole.
      • ejection fraction
      • 75.0%
      • The jugular venous pulse reflects the pressure in which chamber of the heart?
      • Right atrium
      • 75.0%
      • What is a right to left shunt?
      • Blood from some veins goes directly into the left side of the heart and is never oxygenated in the lungs
      • 75.0%
      • The filling of the heart with blood is determined by the [...] pressure.
      • central venous
      • 50.0%
      • The pressure load on the left heart is called [...].
      • afterload
      • 50.0%
      • Vagal tone slows the heart rate from [...] beats per minute to a normal resting heart rate.
      • 100
      • 50.0%
      • The sympathetic nervous system acts on the heart through the [...] receptor.
      • β1
      • 50.0%
      • How does oxygen extraction from the blood in the heart compare to other tissues?
      • Much higher (70% vs. 25%)
      • 50.0%
      • Why is BP measured at the level of the heart?
      • Because BP is affected by gravity (higher BP lower in the body)
      • 50.0%
      • [...] is the normal beating of the heart.
      • Sinus rhythm
      • 50.0%
      • In sinus rhythm, does heart rate stay constant?
      • No, changes with respiration
      • 50.0%
      • During which phase of breathing is a split S2 heart sound most apparent?
      • Inspiration
      • 50.0%
      • The flow out of the heart per heartbeat is called the [...].
      • stroke volume
      • 25.0%
      • The filling pressure of the heart is called [...].
      • preload
      • 25.0%
      • Activation of atrial volume receptors leads to [...]creased sympathetic tone to the heart and vasculature.
      • de
      • 25.0%
      • What is the S3 heart sound caused by?
      • Opening of AV valves and rapid refilling
      • 25.0%
      • What is the S4 heart sound caused by?
      • Atrial systole
      • 25.0%
      • 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?
      • Resting potential is more positive
        Upstroke is much slower
        Resting potential decays spontaneously
      • 25.0%
      • Which phase of the SA node action potential determines heart rate?
      • Decay to spike threshold
      • 25.0%
      • Blood pressure in the feet is [...] mmHg higher than at the level of the heart.
      • 90
      • 25.0%
      • Why are venous pressures above the heart not subatmospheric?
      • Because the veins collapse when the pressure falls
      • 25.0%
      • Why can there be a normal split S2 heart sound during inspiration?
      • 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
      • 25.0%
      • At any given time, [...]% of the body's blood is in the heart.
      • 5
      • 0.0%
      • Afferent sympathetic nerves from the heart travel back to spinal nerves [...]-[...].
      • T1, T5
      • 0.0%
      • What is the Treppe effect?
      • Heart contractility increases with heart rate
      • 0.0%
      • Why does heart contractility increase with heart rate?
      • More Ca2+ is left in the myocyte (less time to remove it between contractions), so produce more force when contracting
      • 0.0%