Question 1

Which of these statements about the coronary arteries is true?

Accepted Answer

A)  The left coronary artery supplies the anterior wall of the heart and most of the left ventricle. 
B)  The right coronary artery supplies most of the right ventricle. 
C)  Blood flow through the coronary arteries is greatest during ventricular diastole (relaxation). 
D)  A heart attack occurs if a coronary artery is blocked. 
E)  All of these are true. 
A)  The left coronary artery supplies the anterior wall of the heart and most of the left ventricle. 
B)  The right coronary artery supplies most of the right ventricle. 
C)  Blood flow through the coronary arteries is greatest during ventricular diastole (relaxation). 
D)  A heart attack occurs if a coronary artery is blocked. 
E)  All of these are true. E

Question 2

Which of these is NOT a factor that increases the risk for cardiovascular disease?

Accepted Answer

A)  smoking 
B)  hypertension 
C)  daily aspirin use 
D)  chronic stress 
E)  lack of physical exercise 
A)  smoking 
B)  hypertension 
C)  daily aspirin use 
D)  chronic stress 
E)  lack of physical exercise C

Question 3

Coronary arteries may become blocked

Accepted Answer

A)  by a thrombus, producing a coronary thrombosis. 
B)  and cause the formation of atherosclerotic lesions. 
C)  as the direct result of angina pectoris. 
D)  as the direct result of an infarct (area of tissue death) in the heart. 
E)  All of these can block coronary arteries. 
A)  by a thrombus, producing a coronary thrombosis. 
B)  and cause the formation of atherosclerotic lesions. 
C)  as the direct result of angina pectoris. 
D)  as the direct result of an infarct (area of tissue death) in the heart. 
E)  All of these can block coronary arteries. A

Question 4

Ventricular systole:

Accepted Answer

A)  occurs between the first and second heart sounds. 
B)  occurs just prior to the first heart sound. 
C)  lasts longer than ventricular diastole 
D)  is the relaxation phase of the ventricles. 
E)  All of the items are true of ventricular systole. 
A)  occurs between the first and second heart sounds. 
B)  occurs just prior to the first heart sound. 
C)  lasts longer than ventricular diastole 
D)  is the relaxation phase of the ventricles. 
E)  All of the items are true of ventricular systole.

Question 5

The cardioregulatory center of the brain is located in the

Accepted Answer

A)  hypothalamus. 
B)  medulla oblongata. 
C)  cerebrum. 
D)  cerebellum. 
E)  thalamus. 
A)  hypothalamus. 
B)  medulla oblongata. 
C)  cerebrum. 
D)  cerebellum. 
E)  thalamus.

Question 6

Like skeletal muscle, cardiac muscle:

Accepted Answer

A)  relies on calcium and ATP to contract 
B)  is controlled by the stimulation of motor units 
C)  uses temporal summation to increase contractile force 
D)  has both fast twitch and slow twitch muscle fiber types 
E)  is multinucleate 
A)  relies on calcium and ATP to contract 
B)  is controlled by the stimulation of motor units 
C)  uses temporal summation to increase contractile force 
D)  has both fast twitch and slow twitch muscle fiber types 
E)  is multinucleate

Question 7

On an ECG, a long P-R interval might indicate

Accepted Answer

A)  tachycardia. 
B)  an AV node block. 
C)  atrial fibrillation. 
D)  sinus arrhythmia. 
E)  an SA node block. 
A)  tachycardia. 
B)  an AV node block. 
C)  atrial fibrillation. 
D)  sinus arrhythmia. 
E)  an SA node block.

Question 8

Which of these is NOT one of the large veins carrying blood to the heart?

Accepted Answer

A)  superior vena cava 
B)  inferior vena cava 
C)  pulmonary trunk 
D)  pulmonary vein 
E)  coronary sinus 
A)  superior vena cava 
B)  inferior vena cava 
C)  pulmonary trunk 
D)  pulmonary vein 
E)  coronary sinus

Question 9

Which of the following is true of cardiac muscle?

Accepted Answer

A)  Cardiac muscle tissue has both an intracellular and extracellular source of Ca++. 
B)  Cardiac muscle tissue has slow Ca++ voltage gates in the membrane that make cardiac muscle incapable of tetanus. 
C)  In cardiac muscle tissue, excitation spreads from cell to cell via intercalated disks. 
D)  Cardiac muscle tissue does not require nerve activity to stimulate a contraction. 
E)  All of these are true of cardiac muscle. 
A)  Cardiac muscle tissue has both an intracellular and extracellular source of Ca++. 
B)  Cardiac muscle tissue has slow Ca++ voltage gates in the membrane that make cardiac muscle incapable of tetanus. 
C)  In cardiac muscle tissue, excitation spreads from cell to cell via intercalated disks. 
D)  Cardiac muscle tissue does not require nerve activity to stimulate a contraction. 
E)  All of these are true of cardiac muscle.

Question 10

Which of these is NOT a characteristic of cardiac muscle?

Accepted Answer

A)  rich in mitochondria 
B)  striated 
C)  has special cell-to-cell contacts called intercalated disks 
D)  can develop a significant oxygen debt 
E)  elongated, branching cells usually with one nucleus 
A)  rich in mitochondria 
B)  striated 
C)  has special cell-to-cell contacts called intercalated disks 
D)  can develop a significant oxygen debt 
E)  elongated, branching cells usually with one nucleus

Question 11

Which of these statements concerning the conduction system of the heart are true?

Accepted Answer

A)  The sinoatrial (S
A)  node of the heart acts as the pacemaker. 
B)  The SA node is located on the upper wall of the left atrium. 
C)  The AV node conducts action potentials rapidly through it. 
D)  Action potentials are carried slowly through the atrioventricular bundle. 
E)  Both the sinoatrial (S
A)  node of the heart acts as the pacemaker and the SA node is located on the upper wall of the left atrium are true. 
A)  The sinoatrial (S
A)  node of the heart acts as the pacemaker. 
B)  The SA node is located on the upper wall of the left atrium. 
C)  The AV node conducts action potentials rapidly through it. 
D)  Action potentials are carried slowly through the atrioventricular bundle. 
E)  Both the sinoatrial (S
A)  node of the heart acts as the pacemaker and the SA node is located on the upper wall of the left atrium are true.

Question 12

Which of the following occurs when the chemoreceptors in the medulla oblongata detect a low blood pH?

Accepted Answer

A)  Parasympathetic stimulation increases. 
B)  The heart rate and stroke volume decrease. 
C)  The adrenal medulla increases the secretion of epinephrine and norepinephrine. 
D)  Blood flow to the lungs decreases. 
E)  The cardioregulatory center decreases sympathetic stimulation. 
A)  Parasympathetic stimulation increases. 
B)  The heart rate and stroke volume decrease. 
C)  The adrenal medulla increases the secretion of epinephrine and norepinephrine. 
D)  Blood flow to the lungs decreases. 
E)  The cardioregulatory center decreases sympathetic stimulation.

Question 13

The layer of the heart wall that is the visceral pericardium is also called the

Accepted Answer

A)  endocardium. 
B)  myocardium. 
C)  epicardium. 
D)  chordae tendineae. 
E)  mediastinum. 
A)  endocardium. 
B)  myocardium. 
C)  epicardium. 
D)  chordae tendineae. 
E)  mediastinum.

Question 14

The cardiac skeleton

Accepted Answer

A)  forms fibrous rings around the atrioventricular and semilunar valves. 
B)  serves as electrical insulation between the atria and ventricles. 
C)  provides a rigid source of attachment for cardiac muscle. 
D)  provides solid support for the heart valves. 
E)  has all of these characteristics. 
A)  forms fibrous rings around the atrioventricular and semilunar valves. 
B)  serves as electrical insulation between the atria and ventricles. 
C)  provides a rigid source of attachment for cardiac muscle. 
D)  provides solid support for the heart valves. 
E)  has all of these characteristics.

Question 15

Tachycardia occurs when

Accepted Answer

A)  the heart rate is less than 60 beats per minute. 
B)  the heart rate is more than 100 beats per minute. 
C)  ventricular fibrillation occurs. 
D)  ectopic beats occur in the atria. 
E)  Either the heart rate is more than 100 beats per minute or ectopic beats occur in the atria happen when tachycardia occurs. 
A)  the heart rate is less than 60 beats per minute. 
B)  the heart rate is more than 100 beats per minute. 
C)  ventricular fibrillation occurs. 
D)  ectopic beats occur in the atria. 
E)  Either the heart rate is more than 100 beats per minute or ectopic beats occur in the atria happen when tachycardia occurs.

Question 16

Which of these factors would cause a decrease in cardiac output?

Accepted Answer

A)  increased body temperature 
B)  increased venous return 
C)  clinical depression 
D)  increased epinephrine secretion 
E)  decreased blood pH 
A)  increased body temperature 
B)  increased venous return 
C)  clinical depression 
D)  increased epinephrine secretion 
E)  decreased blood pH

Question 17

Repolarization of the atria occurs during the __________ on an EKG.

Accepted Answer

A)  P wave 
B)  P-Q (or P-R) interval 
C)  QRS complex 
D)  Q-T interval 
E)  T wave 
A)  P wave 
B)  P-Q (or P-R) interval 
C)  QRS complex 
D)  Q-T interval 
E)  T wave

Question 18

Depolarization of the ventricles is shown as the _________________ on an EKG.

Accepted Answer

A)  P wave 
B)  P-Q (or P-R) interval 
C)  QRS complex 
D)  Q-T interval 
E)  T wave 
A)  P wave 
B)  P-Q (or P-R) interval 
C)  QRS complex 
D)  Q-T interval 
E)  T wave

Question 19

The injection of a calcium channel blocker will cause an increase in which of the following?

Accepted Answer

A)  stroke volume 
B)  contractile strength 
C)  cardiac output 
D)  coronary blood flow 
E)  blood pressure 
A)  stroke volume 
B)  contractile strength 
C)  cardiac output 
D)  coronary blood flow 
E)  blood pressure

Question 20

The tricuspid valve

Accepted Answer

A)  is the location of the pacemaker cells of a normal heart. 
B)  prevents blood flow from the right ventricle to the right atrium. 
C)  prevents blood flow from the left ventricle to the left atrium. 
D)  prevents blood flow from the pulmonary artery to the right ventricle. 
E)  prevents blood flow from the aorta to the left ventricle. 
A)  is the location of the pacemaker cells of a normal heart. 
B)  prevents blood flow from the right ventricle to the right atrium. 
C)  prevents blood flow from the left ventricle to the left atrium. 
D)  prevents blood flow from the pulmonary artery to the right ventricle. 
E)  prevents blood flow from the aorta to the left ventricle.

Which of these statements about the coronary arteries is true?

Which of these is NOT a factor that increases the risk for cardiovascular disease?

Coronary arteries may become blocked

Ventricular systole:

The cardioregulatory center of the brain is located in the

Like skeletal muscle, cardiac muscle:

On an ECG, a long P-R interval might indicate

Which of these is NOT one of the large veins carrying blood to the heart?

Which of the following is true of cardiac muscle?

Which of these is NOT a characteristic of cardiac muscle?

Which of these statements concerning the conduction system of the heart are true?

Which of the following occurs when the chemoreceptors in the medulla oblongata detect a low blood pH?

The layer of the heart wall that is the visceral pericardium is also called the

The cardiac skeleton

Tachycardia occurs when

Which of these factors would cause a decrease in cardiac output?

Repolarization of the atria occurs during the __________ on an EKG.

Depolarization of the ventricles is shown as the _________________ on an EKG.

The injection of a calcium channel blocker will cause an increase in which of the following?

The tricuspid valve

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Exam 12: Heart

Which of these statements about the coronary arteries is true?

Which of these is NOT a factor that increases the risk for cardiovascular disease?

Coronary arteries may become blocked

Ventricular systole:

The cardioregulatory center of the brain is located in the

Like skeletal muscle, cardiac muscle:

On an ECG, a long P-R interval might indicate

Which of these is NOT one of the large veins carrying blood to the heart?

Which of the following is true of cardiac muscle?

Which of these is NOT a characteristic of cardiac muscle?

Which of these statements concerning the conduction system of the heart are true?

Which of the following occurs when the chemoreceptors in the medulla oblongata detect a low blood pH?

The layer of the heart wall that is the visceral pericardium is also called the

The cardiac skeleton

Tachycardia occurs when

Which of these factors would cause a decrease in cardiac output?

Repolarization of the atria occurs during the __________ on an EKG.

Depolarization of the ventricles is shown as the _________________ on an EKG.

The injection of a calcium channel blocker will cause an increase in which of the following?

The tricuspid valve

The Human Organism

The Chemical Basis of Life

Cell Structures and Their Functions

Tissuesasis of Life

Integumentary System

Skeletal System: Bones and Joints

Muscular System

Nervous System

Senses

Endocrine System

Blood

Blood Vessels and Circulation

The Lymphatic System and Immunity

Respiratory System

Digestive System

Nutrition, Metabolism, and Body Temperature Regulation

Urinary System and Fluid Balance

Reproductive System

Development, Heredity, and Aging

Filters