Question 1

Choose a correct sequence of blood flow during one pass through the heart and lungs (some steps may have been omitted):

Accepted Answer

A)  right atrium®bicuspid valve®pulmonary vein 
B)  aortic valve®right ventricle®lung 
C)  lung®pulmonary artery®left atrium 
D)  right ventricle®bicuspid valve®aortic valve 
E)  none of these 
A)  right atrium®bicuspid valve®pulmonary vein 
B)  aortic valve®right ventricle®lung 
C)  lung®pulmonary artery®left atrium 
D)  right ventricle®bicuspid valve®aortic valve 
E)  none of these

Question 2

The function of the chordae tendineae and papillary muscles is to hold the AV valves open during diastole to ensure complete ventricular filling.

Accepted Answer

A) True 
 B)False

Question 3

Which is true when your sympathetic nervous system is more active?

Accepted Answer

A)  The SA node depolarizes more rapidly. 
B)  The myocardium repolarizes more rapidly. 
C)  More Ca2+ becomes available and causes more forceful heart contractions. 
D)  Norepinephrine is stimulating the heart. 
E)  All of these. 
A)  The SA node depolarizes more rapidly. 
B)  The myocardium repolarizes more rapidly. 
C)  More Ca2+ becomes available and causes more forceful heart contractions. 
D)  Norepinephrine is stimulating the heart. 
E)  All of these.

Question 4

Complete each of the following statements with increases, decreases, or has no effect on.
Decreasing venous return ____________________ preload and ____________________ EDV.

Accepted Answer

decreases,

Question 5

Complete each of the following statments.
Myocardial ____________________ is the insufficient circulation of oxygenated blood to cardiac muscle in order to maintain its aerobic metabolism.

Accepted Answer

The answer of Complete each of the following statments.
Myocardial ____________________...

Question 6

Complete each of the following statments.
During the period of ____________________ and the period of ____________________ in the cardiac cycle, all heart valves are closed.

Accepted Answer

isovolumetric contra

Question 7

Why can't tetanus occur in the heart?

Accepted Answer

A)  There are no distinct motor units in the heart. 
B)  There is inadequate oxygen supply via the coronary circulation to metabolically support a sustained contraction. 
C)  The refractory period in cardiac muscle lasts almost as long as the contraction. 
D)  The heart contracts with maximal force every beat so it is impossible to increase the strength of its contraction. 
E)  Vagal stimulation slows down the heart rate to prevent summation of contractions. 
A)  There are no distinct motor units in the heart. 
B)  There is inadequate oxygen supply via the coronary circulation to metabolically support a sustained contraction. 
C)  The refractory period in cardiac muscle lasts almost as long as the contraction. 
D)  The heart contracts with maximal force every beat so it is impossible to increase the strength of its contraction. 
E)  Vagal stimulation slows down the heart rate to prevent summation of contractions.

Question 8

Complete each of the following statments.
The ____________________ is the normal pacemaker of the heart.

Accepted Answer

The answer of Complete each of the following statments.
The ____________________...

Question 9

Complete each of the following statements with increases, decreases, or has no effect on.
An increase in cardiac sympathetic activity ____________________ the velocity of impulse conduction through the heart.

Accepted Answer

The answer of Complete each of the following statements with...

Question 10

Vagal influences on the heart result in

Accepted Answer

A)  enhanced calcium permeability at the SA node 
B)  enhanced potassium permeability at the SA node 
C)  less frequent depolarization of the SA node 
D)  enhanced calcium permeability at the SA node and enhanced potassium permeability at the SA node 
E)  enhanced potassium permeability at the SA node and less frequent depolarization of the SA node 
A)  enhanced calcium permeability at the SA node 
B)  enhanced potassium permeability at the SA node 
C)  less frequent depolarization of the SA node 
D)  enhanced calcium permeability at the SA node and enhanced potassium permeability at the SA node 
E)  enhanced potassium permeability at the SA node and less frequent depolarization of the SA node

Question 11

A pacemaker potential depends on the increased inward current of calcium ions.

Accepted Answer

A) True 
 B)False

Question 12

An insufficient AV valve

Accepted Answer

A)  fails to open completely 
B)  is not connected to chordae tendineae 
C)  produces a gurgling diastolic murmur 
D)  allows blood to backflow into a ventricle during diastole 
E)  none of these 
A)  fails to open completely 
B)  is not connected to chordae tendineae 
C)  produces a gurgling diastolic murmur 
D)  allows blood to backflow into a ventricle during diastole 
E)  none of these

Question 13

Complete each of the following statements with increases, decreases, or has no effect on.
An increase in stroke volume ____________________ ESV.

Accepted Answer

The answer of Complete each of the following statements with...

Question 14

The long refractory period of cardiac muscle prevents tetanic contractions of the heart.

Accepted Answer

A) True 
 B)False

Question 15

Which of the following ECG waves represents ventricular repolarization?

Accepted Answer

A)  P wave 
B)  QRS complex 
C)  T wave 
D)  PR segment 
E)  Ventricular repolarization occurs simultaneously with atrial depolarization and consequently cannot be recorded. 
A)  P wave 
B)  QRS complex 
C)  T wave 
D)  PR segment 
E)  Ventricular repolarization occurs simultaneously with atrial depolarization and consequently cannot be recorded.

Question 16

During isovolumetric contraction,

Accepted Answer

A)  Rapid filling of the ventricles occurs. 
B)  No blood enters or leaves the ventricles. 
C)  The maximum volume of blood is ejected. 
D)  The maximum rate of ejection occurs. 
E)  Both the maximum volume of blood is ejected and the maximum rate of ejection occurs. 
A)  Rapid filling of the ventricles occurs. 
B)  No blood enters or leaves the ventricles. 
C)  The maximum volume of blood is ejected. 
D)  The maximum rate of ejection occurs. 
E)  Both the maximum volume of blood is ejected and the maximum rate of ejection occurs.

Question 17

Complete each of the following statments.
The ____________________ is the volume of blood pumped by each ventricle/minute.

Accepted Answer

The answer of Complete each of the following statments.
The ____________________...

Question 18

Contraction of the spirally arranged cardiac muscle fibers produces a wringing effect for efficient pumping.

Accepted Answer

A) True 
 B)False

Question 19

The function of the ventricular conduction system of the heart is to

Accepted Answer

A)  spread the action potential throughout the ventricle to ensure a single, coordinated contraction of the both ventricles 
B)  spread the action potential in the absence of sympathetic stimulation 
C)  spread the action potential throughout the atria and ventricles 
D)  slow down the original action potential so it has time to spread through the ventricles evenly 
E)  spread the action potential throughout the ventricle to ensure a single, coordinated contraction of the both ventricles, and slow down the original action potential so it has time to spread through the ventricles evenly 
A)  spread the action potential throughout the ventricle to ensure a single, coordinated contraction of the both ventricles 
B)  spread the action potential in the absence of sympathetic stimulation 
C)  spread the action potential throughout the atria and ventricles 
D)  slow down the original action potential so it has time to spread through the ventricles evenly 
E)  spread the action potential throughout the ventricle to ensure a single, coordinated contraction of the both ventricles, and slow down the original action potential so it has time to spread through the ventricles evenly

Question 20

The fastest rate of autorhythmicity is normally carried out by the

Accepted Answer

A)  AV bundle 
B)  AV node 
C)  bundle of His 
D)  Purkinje fibers 
E)  SA node 
A)  AV bundle 
B)  AV node 
C)  bundle of His 
D)  Purkinje fibers 
E)  SA node

Exam 9: A--Cardiac Physiology

Choose a correct sequence of blood flow during one pass through the heart and lungs (some steps may have been omitted):

The function of the chordae tendineae and papillary muscles is to hold the AV valves open during diastole to ensure complete ventricular filling.

Which is true when your sympathetic nervous system is more active?

Complete each of the following statements with increases, decreases, or has no effect on. Decreasing venous return ____________________ preload and ____________________ EDV.

Complete each of the following statments. Myocardial ____________________ is the insufficient circulation of oxygenated blood to cardiac muscle in order to maintain its aerobic metabolism.

Complete each of the following statments. During the period of ____________________ and the period of ____________________ in the cardiac cycle, all heart valves are closed.

Why can't tetanus occur in the heart?

Complete each of the following statments. The ____________________ is the normal pacemaker of the heart.

Complete each of the following statements with increases, decreases, or has no effect on. An increase in cardiac sympathetic activity ____________________ the velocity of impulse conduction through the heart.

Vagal influences on the heart result in

A pacemaker potential depends on the increased inward current of calcium ions.

An insufficient AV valve

Complete each of the following statements with increases, decreases, or has no effect on. An increase in stroke volume ____________________ ESV.

The long refractory period of cardiac muscle prevents tetanic contractions of the heart.

Which of the following ECG waves represents ventricular repolarization?

During isovolumetric contraction,

Complete each of the following statments. The ____________________ is the volume of blood pumped by each ventricle/minute.

Contraction of the spirally arranged cardiac muscle fibers produces a wringing effect for efficient pumping.

The function of the ventricular conduction system of the heart is to

The fastest rate of autorhythmicity is normally carried out by the

Introduction to Physiology and Homeostasis

Cell Physiology

The Plasma Membrane and Membrane Potential

Principles of Neural and Hormonal Communication

A--The Central Nervous System

B--The Central Nervous System

A--The Peripheral Nervous System: Afferent Division; Special Senses

B--The Peripheral Nervous System: Afferent Division; Special Senses

The Peripheral Nervous System: Efferent Division

A--Muscle Physiology

B--Muscle Physiology

B--Cardiac Physiology

The Blood Vessels and Blood Pressure

The Blood

Body Defenses

A--The Respiratory System

B--The Respiratory System

A--The Urinary System

B--The Urinary System

A--Fluid and Acid-Base Balance

B--Fluid and Acid-Base Balance

A--The Digestive System

B--The Digestive System

Energy Balance and Temperature Regulation

A--Principles of Endocrinology: the Central Endocrine Glands

B--Principles of Endocrinology: the Central Endocrine Glands

A--The Peripheral Endocrine Glands

B--The Peripheral Endocrine Glands

A--The Reproductive System

B--The Reproductive System

Filters

Complete each of the following statements with increases, decreases, or has no effect on. Decreasing venous return preload and EDV.

Complete each of the following statments. During the period of and the period of in the cardiac cycle, all heart valves are closed.