Question 1

The long absolute refractory period of cardiocytes _________.

Accepted Answer

A)  ensures a short twitch
B)  prevents tetanus
C)  makes the heart prone to arrhythmias
D)  prevents the occurrence of ectopic focuses
E)  causes the pacemaker potentialF) A) and B)
G) All of the above

Question 2

The apex of the heart is found __________ of the midline of the body.

Accepted Answer

A)  to the right
B)  to the left
C)  in the centerD) All of the above
E) A) and B)

Question 3

Which of the following directly stems from the ascending aorta before it branches into the circumflex branch and anterior interventricular branch?

Accepted Answer

A)  Right coronary artery
B)  Great cardiac vein
C)  Right coronary vein
D)  Left coronary artery
E)  Left coronary veinF) All of the above
G) None of the above

Question 4

Congestive heart failure (CHF) of the right ventricle __________.

Accepted Answer

A)  can cause pulmonary edema
B)  can cause systemic edema
C)  increases the ejection fraction of the right ventricle
D)  reduces the ejection fraction of the left ventricle
E)  increases cardiac output in both ventriclesF) A) and B)
G) C) and D)

Question 5

Papillary muscles prevent the AV valves from prolapsing (bulging)excessively into the atria when the ventricles contract.

Accepted Answer

A) True 
 B)False

Question 6

After entering the right atrium,the furthest a red blood cell can travel is the _________.

Accepted Answer

A)  right ventricle
B)  pulmonary trunk
C)  superior vena cava
D)  ascending aorta
E)  left atriumF) B) and C)
G) A) and D)

Question 7

Repolarization of a ventricular cardiocyte takes longer than repolarization of a typical neuron.

Accepted Answer

A) True 
 B)False

Question 8

When the ventricles relax,the __________ valve prevents backflow of blood into the left ventricle.

Accepted Answer

A)  aortic
B)  pulmonary
C)  mitral
D)  left AV
E)  right AVF) A) and B)
G) C) and D)

Question 9

Cardioinhibitory centers in the __________ receive input from __________.

Accepted Answer

A)  cortex; proprioceptors in the muscles
B)  thalamus; chemoreceptors in the medulla oblongata
C)  hypothalamus; proprioceptors in the joints
D)  medulla oblongata; chemoreceptors in the aortic arch
E)  pons; baroreceptors in the internal carotidF) A) and D)
G) D) and E)

Question 10

Which is the correct path of an electrical excitation from the pacemaker to a cardiocyte in the left ventricle (LV) ?

Accepted Answer

A)  Sinoatrial (S
A)   node  →\rarr→  atrioventricular (AV)  bundle  →\rarr→  atrioventricular (AV)  node  →\rarr→  Purkinje fibers  →\rarr→  cardiocyte in LV
B)  Atrioventricular (AV)  node  →\rarr→  Purkinje fibers  →\rarr→  atrioventricular (AV)  bundle  →\rarr→  sinoatrial (S
A)   node  →\rarr→  cardiocyte in LV
C)  Atrioventricular (AV)  node  →\rarr→ sinoatrial (S
A)   node  →\rarr→  atrioventricular (AV)  bundle  →\rarr→  Purkinje fibers  →\rarr→  cardiocyte in LV
D)  Sinoatrial (S
A)   node  →\rarr→ atrioventricular (AV)  node  →\rarr→  atrioventricular (AV)  bundle  →\rarr→  Purkinje fibers  →\rarr→  cardiocyte in LV
E)  Sinoatrial (S
A)   node  →\rarr→  atrioventricular (AV)  node  →\rarr→  Purkinje fibers  →\rarr→  atrioventricular (AV)  bundle  →\rarr→  cardiocyte in LV F) C) and E)
G) B) and E)

Question 11

Which of the following is not a feature of cardiac muscle?

Accepted Answer

A)  They depend almost exclusively on aerobic respiration.
B)  They are rich in glycogen.
C)  They have larger than average mitochondria.
D)  They are very rich in myoglobin.
E)  They have about the same endurance as skeletal muscle fibers.F) A) and B)
G) A) and C)

Question 12

Pericardial fluid is found between the __________ and the __________.

Accepted Answer

A)  visceral pericardium; myocardium
B)  visceral pericardium; epicardium
C)  parietal; visceral membranes
D)  myocardium; endocardium
E)  epicardium; myocardiumF) C) and E)
G) A) and B)

Question 13

Cardiac muscle can only use glucose as a source of organic fuel.

Accepted Answer

A) True 
 B)False

Question 14

The ventricles are almost empty at the end of ventricular diastole.

Accepted Answer

A) True 
 B)False

Question 15

Blood in the heart chambers provides most of the myocardium's oxygen and nutrient needs.

Accepted Answer

A) True 
 B)False

Question 16

The area where the major vessels lead to and from the heart's chambers is called the __________ of the heart.The pointy,inferior portion is called the ___________.

Accepted Answer

A)  apex; base
B)  atrium; ventricle
C)  ventricle; atrium
D)  base; apex
E)  endocardium; epicardiumF) A) and B)
G) A) and C)

Question 17

The volume of blood ejected by each ventricle in one minute is called the __________.

Accepted Answer

A)  cardiac reserve
B)  preload
C)  afterload
D)  stroke volume
E)  cardiac outputF) C) and E)
G) A) and D)

Question 18

Which is the correct sequence of events of the cardiac cycle?

Accepted Answer

A)  Ventricular filling  →\rarr→  isovolumetric contraction  →\rarr→  isovolumetric relaxation  →\rarr→  ventricular ejection
B)  Ventricular filling  →\rarr→ isovolumetric relaxation  →\rarr→  isovolumetric contraction  →\rarr→  ventricular ejection
C)  Ventricular filling  →\rarr→  ventricular ejection  →\rarr→  isovolumetric contraction  →\rarr→  isovolumetric relaxation
D)  Ventricular filling  →\rarr→  isovolumetric relaxation  →\rarr→  ventricular ejection  →\rarr→  isovolumetric contraction
E)  Ventricular filling  →\rarr→ isovolumetric contraction  →\rarr→  ventricular ejection  →\rarr→  isovolumetric relaxation F) All of the above
G) B) and D)

Question 19

Oxygen-poor blood passes through the _________.

Accepted Answer

A)  right AV (tricuspid)  and pulmonary valves
B)  right AV (tricuspid)  valve only
C)  left AV (mitral)  and aortic valves
D)  left AV (mitral)  valve only
E)  pulmonary and aortic valvesF) C) and D)
G) B) and D)

Question 20

During isovolumetric contraction,the pressure in the ventricles __________.

Accepted Answer

A)  falls rapidly
B)  rises rapidly
C)  remains constant
D)  rises and then falls
E)  falls and then risesF) B) and C)
G) A) and B)

Exam 19: The Circulatory System: Heart

During isovolumetric contraction,the pressure in the ventricles __________.

Correct AnswerverifiedShow Answer

Oxygen-poor blood passes through the _________.

Correct AnswerverifiedShow Answer

When the ventricles relax,the __________ valve prevents backflow of blood into the left ventricle.

Correct AnswerverifiedShow Answer

Pericardial fluid is found between the __________ and the __________.

Correct AnswerverifiedShow Answer

The long absolute refractory period of cardiocytes _________.

Correct AnswerverifiedShow Answer

The volume of blood ejected by each ventricle in one minute is called the __________.

Correct AnswerverifiedShow Answer

Which of the following is not a feature of cardiac muscle?

Correct AnswerverifiedShow Answer

After entering the right atrium,the furthest a red blood cell can travel is the _________.

Correct AnswerverifiedShow Answer

Which is the correct sequence of events of the cardiac cycle?

Correct AnswerverifiedShow Answer

Congestive heart failure (CHF) of the right ventricle __________.

Correct AnswerverifiedShow Answer

The area where the major vessels lead to and from the heart's chambers is called the __________ of the heart.The pointy,inferior portion is called the ___________.

Correct AnswerverifiedShow Answer

Cardioinhibitory centers in the __________ receive input from __________.

Correct AnswerverifiedShow Answer

The apex of the heart is found __________ of the midline of the body.

Correct AnswerverifiedShow Answer

The ventricles are almost empty at the end of ventricular diastole.

Correct AnswerverifiedShow Answer

Which of the following directly stems from the ascending aorta before it branches into the circumflex branch and anterior interventricular branch?

Correct AnswerverifiedShow Answer

Which is the correct path of an electrical excitation from the pacemaker to a cardiocyte in the left ventricle (LV) ?

Correct AnswerverifiedShow Answer

Cardiac muscle can only use glucose as a source of organic fuel.

Correct AnswerverifiedShow Answer

Repolarization of a ventricular cardiocyte takes longer than repolarization of a typical neuron.

Correct AnswerverifiedShow Answer

Papillary muscles prevent the AV valves from prolapsing (bulging)excessively into the atria when the ventricles contract.

Correct AnswerverifiedShow Answer

Blood in the heart chambers provides most of the myocardium's oxygen and nutrient needs.

Correct AnswerverifiedShow Answer

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Pericardial fluid is found between the and the .

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The area where the major vessels lead to and from the heart's chambers is called the of the heart.The pointy,inferior portion is called the _.

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Cardioinhibitory centers in the receive input from .

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