"Mastering Cardiovascular Physiology: A
Comprehensive Guide with 100+ QCMs & Medical
Reasoning"
Introduction
This work is more than just a collection of questions; it is
a dedicated effort to simplify the most complex concepts
in Cardiovascular Physiology. These QCMs are specifically
designed to simulate international exam patterns,
providing you with detailed medical reasoning for each
answer to ensure deep clinical understanding rather
than just rote memorization."
Table of Contents
1. Cardiac Rhythmic Activation (Questions 1 to 22)
2. ECG: (6 questions)
3. The Cardiac Pump: Cardiac Cycle, Output, and Variation Factors
(Questions 1 to 34)
4. Circulation: Functional Differentiation of Vessels (17 questions)"
5. Regulation of Arterial Blood Pressure: High-Pressure System (25
questions)
6. Circulation in the Low-Pressure System (8 questions )
7. Coronary Circulation (4 questions )
8 Correct Answers & Detailed Medical Reasoning
, "All Rights Reserved © 2024 prepared by:CHABLI MARWA. no part of this
document may be reproduced or resold without permission."
1. Cardiac Rhythmic Activation (Questions 1 to 22)
1. Automaticity (Automaticité)
. Electrogenic tissues require stimulation to contract.
A
B. The resting potential of Sinoatrial (SA) node cells differs from that of ventricular
myocytes.
C. Sinoatrial node cells possess the highest rate of spontaneous automaticity.
D. Ventricular cells possess the highest depolarization rate (100 bpm).
E. Internodal pathways generate the impulse and ensure its conduction from the
pacemaker center to the Atrioventricular (AV) node.
2. Cardiomyocyte Automatism (L'automatisme des cardiomyocytes)
. Depends on the spontaneous occurrence of a cellular action potential due to
A
transmembrane ionic currents.
B. Results in an identical action potential for all automatic cells.
C. Presents several phases, including repolarization, which essentially depends on active
outgoing sodium currents.
D. Originates in the Sinoatrial node located in the left atrium.
E. Is characterized by a spontaneous depolarization slope; the steepest slope is recorded
in the Sinoatrial node cells.
3. Depolarization during Automaticity (La dépolarisation lors de l’automaticité)
A. Occurs when the excitation threshold (approximately -40mV) is reached.
, . Ca^{2+} channels open, allowing a massive influx of Ca^{2+}.
B
C. In pacemaker cells, the diffusion of Na^{+} into the sarcoplasm is the cause of
membrane potential inversion.
D. Ca^{2+} diffusion is the cause of membrane potential inversion and the upstroke
(ascending phase) of the action potential.
E. The interior of the membrane becomes progressively less positive.
4. Repolarization during Automaticity (La Repolarisation lors de l'Automaticité)
. Ca^{2+} channels become inactive.
A
B. In pacemaker cells, the diffusion of Na^{+} into the sarcoplasm is the cause of
membrane potential inversion.
C. Reflects the opening of K^{+} channels.
D. Diffusion of K^{+} ions toward the interstitial fluid.
E. The interior of the membrane becomes progressively less negative.
5. Pacemaker Potential (Potentiel rythmogène)
. Is attributable to the specific properties of the sarcolemmal ion channels.
A
B. Hyperpolarization occurring at the end of an action potential leads to the closure of
K^{+} channels.
C. Hyperpolarization occurring at the end of an action potential leads to the closure of
slow Na^{+} channels.
D. Na^{+} influx disrupts the balance between K^{+} loss (efflux) and Na^{+} gain (influx).
E. The interior of the membrane becomes progressively less positive.
6. Conduction
A. Is characterized by a homogeneous conduction velocity of the action potential
B. Allows, through the conduction tissue, the propagation of the action potential from the
sinus node to the ventricles.
C. Allows, through the conduction tissue, the propagation of the action potential only in
the atria-to-ventricles direction
D. When the ventricles polarize, the atria begin to repolarize at that moment.
E. Impulse conduction occurs first in the right heart and then in the left heart.
7. Nodal Tissue
A. Is composed of myocardial cells whose mechanical activities are automatic.
B. Its cells spontaneously produce an electrical signal.
C. Is located in the posterior wall of the right atrium under the name of the
atrioventricular node.
, D. It is located in the posterior wall of the right atrium under the name of the sinus node.
E. Is independent of the autonomic nervous system.
8. Electrogenic Tissue
A. Impulse conduction occurs first in the right heart and then in the left heart.
B. The sinus node generates the impulse and transmits it at the same speed to the
atrioventricular node and to all myocardial cells.
C. At the level of the bundle of His, the conduction velocity is the highest, 6 times faster
than the conduction velocity of a myocardial cell.
D. Both ventricles contract at the same time and in the same manner.
E. The sinus node has the highest spontaneous automaticity frequency, which is
approximately 80 beats per minute.
9. Excitation-Contraction Coupling
A. Leads to the depolarization of the plasma membrane.
B. Causes an increase in cytosolic calcium.
C. Binding of calcium to calcium receptors located on the inner side of the sarcoplasmic
reticulum membrane.
D. Ca^{++} binds to Troponin and triggers muscle contraction.
E. Release of myosin binding sites on actin with actin-myosin interaction responsible for
relaxation.
F. The action potential occurs at the same time as the muscle tension.
G. The excitation of a cardiac fiber leads to the appearance of an action potential followed
by a contraction that occurs with a certain delay.
H. Binding of norepinephrine to the nicotinic receptor present on the sarcolemma.
I. The repolarization phase approximately coincides with the peak of muscle tension.
J. The release of calcium into the cytosol is induced by calcium.
K. Binding of acetylcholine to the nicotinic receptor present on the sarcolemma.
L. Entry of sodium into the cell causing depolarization and then an action potential.
M. Configuration change of the DHP receptor leading to the closing of the sarcoplasmic
reticulum calcium channels.
Comprehensive Guide with 100+ QCMs & Medical
Reasoning"
Introduction
This work is more than just a collection of questions; it is
a dedicated effort to simplify the most complex concepts
in Cardiovascular Physiology. These QCMs are specifically
designed to simulate international exam patterns,
providing you with detailed medical reasoning for each
answer to ensure deep clinical understanding rather
than just rote memorization."
Table of Contents
1. Cardiac Rhythmic Activation (Questions 1 to 22)
2. ECG: (6 questions)
3. The Cardiac Pump: Cardiac Cycle, Output, and Variation Factors
(Questions 1 to 34)
4. Circulation: Functional Differentiation of Vessels (17 questions)"
5. Regulation of Arterial Blood Pressure: High-Pressure System (25
questions)
6. Circulation in the Low-Pressure System (8 questions )
7. Coronary Circulation (4 questions )
8 Correct Answers & Detailed Medical Reasoning
, "All Rights Reserved © 2024 prepared by:CHABLI MARWA. no part of this
document may be reproduced or resold without permission."
1. Cardiac Rhythmic Activation (Questions 1 to 22)
1. Automaticity (Automaticité)
. Electrogenic tissues require stimulation to contract.
A
B. The resting potential of Sinoatrial (SA) node cells differs from that of ventricular
myocytes.
C. Sinoatrial node cells possess the highest rate of spontaneous automaticity.
D. Ventricular cells possess the highest depolarization rate (100 bpm).
E. Internodal pathways generate the impulse and ensure its conduction from the
pacemaker center to the Atrioventricular (AV) node.
2. Cardiomyocyte Automatism (L'automatisme des cardiomyocytes)
. Depends on the spontaneous occurrence of a cellular action potential due to
A
transmembrane ionic currents.
B. Results in an identical action potential for all automatic cells.
C. Presents several phases, including repolarization, which essentially depends on active
outgoing sodium currents.
D. Originates in the Sinoatrial node located in the left atrium.
E. Is characterized by a spontaneous depolarization slope; the steepest slope is recorded
in the Sinoatrial node cells.
3. Depolarization during Automaticity (La dépolarisation lors de l’automaticité)
A. Occurs when the excitation threshold (approximately -40mV) is reached.
, . Ca^{2+} channels open, allowing a massive influx of Ca^{2+}.
B
C. In pacemaker cells, the diffusion of Na^{+} into the sarcoplasm is the cause of
membrane potential inversion.
D. Ca^{2+} diffusion is the cause of membrane potential inversion and the upstroke
(ascending phase) of the action potential.
E. The interior of the membrane becomes progressively less positive.
4. Repolarization during Automaticity (La Repolarisation lors de l'Automaticité)
. Ca^{2+} channels become inactive.
A
B. In pacemaker cells, the diffusion of Na^{+} into the sarcoplasm is the cause of
membrane potential inversion.
C. Reflects the opening of K^{+} channels.
D. Diffusion of K^{+} ions toward the interstitial fluid.
E. The interior of the membrane becomes progressively less negative.
5. Pacemaker Potential (Potentiel rythmogène)
. Is attributable to the specific properties of the sarcolemmal ion channels.
A
B. Hyperpolarization occurring at the end of an action potential leads to the closure of
K^{+} channels.
C. Hyperpolarization occurring at the end of an action potential leads to the closure of
slow Na^{+} channels.
D. Na^{+} influx disrupts the balance between K^{+} loss (efflux) and Na^{+} gain (influx).
E. The interior of the membrane becomes progressively less positive.
6. Conduction
A. Is characterized by a homogeneous conduction velocity of the action potential
B. Allows, through the conduction tissue, the propagation of the action potential from the
sinus node to the ventricles.
C. Allows, through the conduction tissue, the propagation of the action potential only in
the atria-to-ventricles direction
D. When the ventricles polarize, the atria begin to repolarize at that moment.
E. Impulse conduction occurs first in the right heart and then in the left heart.
7. Nodal Tissue
A. Is composed of myocardial cells whose mechanical activities are automatic.
B. Its cells spontaneously produce an electrical signal.
C. Is located in the posterior wall of the right atrium under the name of the
atrioventricular node.
, D. It is located in the posterior wall of the right atrium under the name of the sinus node.
E. Is independent of the autonomic nervous system.
8. Electrogenic Tissue
A. Impulse conduction occurs first in the right heart and then in the left heart.
B. The sinus node generates the impulse and transmits it at the same speed to the
atrioventricular node and to all myocardial cells.
C. At the level of the bundle of His, the conduction velocity is the highest, 6 times faster
than the conduction velocity of a myocardial cell.
D. Both ventricles contract at the same time and in the same manner.
E. The sinus node has the highest spontaneous automaticity frequency, which is
approximately 80 beats per minute.
9. Excitation-Contraction Coupling
A. Leads to the depolarization of the plasma membrane.
B. Causes an increase in cytosolic calcium.
C. Binding of calcium to calcium receptors located on the inner side of the sarcoplasmic
reticulum membrane.
D. Ca^{++} binds to Troponin and triggers muscle contraction.
E. Release of myosin binding sites on actin with actin-myosin interaction responsible for
relaxation.
F. The action potential occurs at the same time as the muscle tension.
G. The excitation of a cardiac fiber leads to the appearance of an action potential followed
by a contraction that occurs with a certain delay.
H. Binding of norepinephrine to the nicotinic receptor present on the sarcolemma.
I. The repolarization phase approximately coincides with the peak of muscle tension.
J. The release of calcium into the cytosol is induced by calcium.
K. Binding of acetylcholine to the nicotinic receptor present on the sarcolemma.
L. Entry of sodium into the cell causing depolarization and then an action potential.
M. Configuration change of the DHP receptor leading to the closing of the sarcoplasmic
reticulum calcium channels.
