mastering physiology exam 3 Review 2024| Que plus
Answers
During the pacemaker potential, membrane permeability increases for which of the
following ions? ** Answ** Sodium
Potassium
Calcium
Which of the following statements about the structure of the heart is(are) true? **
Answ** The structure of the atrioventricular and semilunar valves helps to ensure that
blood flows in only one direction through the heart.
The structure of the atrioventricular and semilunar valves helps to ensure that blood
flows in only one direction through the heart and the innermost layer of epithelial cells,
the endothelium, lines the inside of the entire cardiovascular system.
The innermost layer of epithelial cells, the endothelium, lines the inside of the entire
cardiovascular system.
The left ventricular wall is thicker than the right.
Calcium is removed from the cytosol of cardiac muscle cells by __________. **
Answ** Ca2+ ATPases in the sarcoplasmic reticulum, Ca2+/Na+ exchangers in the
plasma membrane, and Ca2+ ATPases in the plasma membrane
Put the following structures involved in cardiac impulse conduction in the correct order:
AV node
Purkinje fibers
SA node
bundle of His ** Answ** c, a, d, b
Stenosis (scarring and thickening) in the bicuspid valve would directly affect
__________. ** Answ** left ventricle filling
Which of the following statements about the systemic circuit is(are) true? ** Answ**
All organs within this circuit that are supplied with blood (including the heart) are in
parallel with each other, some organs are in series with one another, and blood flow to
each organ can be independently regulated.
In contrast to most other types of excitable cells, cardiac contractile cells __________.
** Answ** have a plateau phase in the action potential
For assistance with assignments contact
, Which of the following statements regarding ion movement during action potentials in
the heart is correct? ** Answ** The rising phase of the action potential in cardiac
contractile cells is due to rapid Na+ influx
Which of the following is true regarding pulmonary circulation? ** Answ** Pulmonary
arteries carry deoxygenated blood to the lungs.
Which of the following properly represents blood flow through the heart? ** Answ**
right atrium right ventricle left atrium left ventricle
Which of the following mechanical events will occur as a result of the electrical events
that produce the QRS complex in an electrocardiogram (ECG)? ** Answ**
Ventricular systole
Which of the following statements about the pulmonary and systemic circuits is(are)
true? ** Answ** The vena cavae carry deoxygenated blood toward the heart and the
aorta carries oxygenated blood away from the heart.
What does the P wave of the ECG represent? ** Answ** atrial depolarization
Electrical signaling in the heart begins in the SA node because __________. **
Answ** it depolarizes the fastest
Which of the following observations would you expect to see on an ECG when you
begin to exercise? ** Answ** Shorter T-P interval
In the electrocardiogram (ECG), the T wave corresponds to the __________. **
Answ** repolarization of the ventricles
According to the anatomical definition, an artery is a blood vessel that __________. **
Answ** transports blood away from the heart
The total flow rate of blood is __________ in the arterial system compared to the
venous system, and the velocity of flow is __________ in arteries compared to veins of
comparable size. ** Answ** the same; greater
Which of the following sequences correctly correlates the electrical signals of the ECG
with the mechanical events of the cardiac cycle? ** Answ** P-R segment—period of
atrial contraction
Which of the following statements is(are) not true?
Pacemaker cells generate action potentials in the absence of input from the nervous
system and fibers in the bundle of His can act as pacemakers.
For assistance with assignments contact
Answers
During the pacemaker potential, membrane permeability increases for which of the
following ions? ** Answ** Sodium
Potassium
Calcium
Which of the following statements about the structure of the heart is(are) true? **
Answ** The structure of the atrioventricular and semilunar valves helps to ensure that
blood flows in only one direction through the heart.
The structure of the atrioventricular and semilunar valves helps to ensure that blood
flows in only one direction through the heart and the innermost layer of epithelial cells,
the endothelium, lines the inside of the entire cardiovascular system.
The innermost layer of epithelial cells, the endothelium, lines the inside of the entire
cardiovascular system.
The left ventricular wall is thicker than the right.
Calcium is removed from the cytosol of cardiac muscle cells by __________. **
Answ** Ca2+ ATPases in the sarcoplasmic reticulum, Ca2+/Na+ exchangers in the
plasma membrane, and Ca2+ ATPases in the plasma membrane
Put the following structures involved in cardiac impulse conduction in the correct order:
AV node
Purkinje fibers
SA node
bundle of His ** Answ** c, a, d, b
Stenosis (scarring and thickening) in the bicuspid valve would directly affect
__________. ** Answ** left ventricle filling
Which of the following statements about the systemic circuit is(are) true? ** Answ**
All organs within this circuit that are supplied with blood (including the heart) are in
parallel with each other, some organs are in series with one another, and blood flow to
each organ can be independently regulated.
In contrast to most other types of excitable cells, cardiac contractile cells __________.
** Answ** have a plateau phase in the action potential
For assistance with assignments contact
, Which of the following statements regarding ion movement during action potentials in
the heart is correct? ** Answ** The rising phase of the action potential in cardiac
contractile cells is due to rapid Na+ influx
Which of the following is true regarding pulmonary circulation? ** Answ** Pulmonary
arteries carry deoxygenated blood to the lungs.
Which of the following properly represents blood flow through the heart? ** Answ**
right atrium right ventricle left atrium left ventricle
Which of the following mechanical events will occur as a result of the electrical events
that produce the QRS complex in an electrocardiogram (ECG)? ** Answ**
Ventricular systole
Which of the following statements about the pulmonary and systemic circuits is(are)
true? ** Answ** The vena cavae carry deoxygenated blood toward the heart and the
aorta carries oxygenated blood away from the heart.
What does the P wave of the ECG represent? ** Answ** atrial depolarization
Electrical signaling in the heart begins in the SA node because __________. **
Answ** it depolarizes the fastest
Which of the following observations would you expect to see on an ECG when you
begin to exercise? ** Answ** Shorter T-P interval
In the electrocardiogram (ECG), the T wave corresponds to the __________. **
Answ** repolarization of the ventricles
According to the anatomical definition, an artery is a blood vessel that __________. **
Answ** transports blood away from the heart
The total flow rate of blood is __________ in the arterial system compared to the
venous system, and the velocity of flow is __________ in arteries compared to veins of
comparable size. ** Answ** the same; greater
Which of the following sequences correctly correlates the electrical signals of the ECG
with the mechanical events of the cardiac cycle? ** Answ** P-R segment—period of
atrial contraction
Which of the following statements is(are) not true?
Pacemaker cells generate action potentials in the absence of input from the nervous
system and fibers in the bundle of His can act as pacemakers.
For assistance with assignments contact
