Question 1

Which of the following is the most superficial layer enclosing the heart?

Accepted Answer

A)   Parietal pericardium
B)   Visceral pericardium
C)   Endocardium
D)   Epicardium
E)   Myocardium

Question 2

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 carotid

Question 3

The __________ carry blood toward the lungs.

Accepted Answer

A)   pulmonary arteries and veins
B)   pulmonary trunk and arteries
C)   pulmonary trunk and veins
D)   superior and inferior venae cavae
E)   aorta and pulmonary arteries

Question 4

The cardiac plexus and cardiac nerves dominate the innervation of the heart and contains both parasympathetic and sympathetic fibers.

Accepted Answer

A) True 
 B)False

Question 5

An extended period of time between the P wave and the QRS complex may indicate which of the following?

Accepted Answer

A)   The signal is taking too long to get to the AV node.
B)   The signal is traveling too quickly to the AV node.
C)   Ventricular contraction is taking longer than usual.
D)   Ventricular contraction is faster than usual.
E)   The atria are not contracting. A

Question 6

The long plateau in the action potential observed in cardiomyocytes is probably related with __________ staying longer in the cytosol.

Accepted Answer

A)   Na+
B)   K+
C)   Ca2+
D)   Cl-
E)   Na+,K+,and Ca2+

Question 7

Most of the ventricle filling occurs __________.

Accepted Answer

A)   during atrial systole
B)   when the AV valve is closed
C)   during ventricular systole
D)   during atrial diastole
E)   during isovolumetric contraction

Question 8

Obstruction of the ___________ will cause a more severe myocardial infarction (MI) than the obstruction of any of the others.

Accepted Answer

A)   left marginal vein
B)   left coronary artery (LC
A)  
C)   posterior interventricular vein
D)   anterior interventricular branch
E)   circumflex branch

Question 9

Which of the following blood vessels receives blood directly from the right ventricle?

Accepted Answer

A)   Pulmonary trunk
B)   Ascending aorta
C)   Superior vena cava
D)   Inferior vena cava
E)   Right pulmonary vein

Question 10

The heart is located in the space called the __________.

Accepted Answer

A)   pericardial cavity
B)   mediastinum
C)   abdominal cavity
D)   pleural cavity
E)   myocardium

Question 11

Hypercapnia and acidosis have positive chronotropic effects.

Accepted Answer

A) True 
 B)False

Question 12

Stroke volume is increased by __________.

Accepted Answer

A)   high arterial blood pressure
B)   negative inotropic agents
C)   increased venous return
D)   increased afterload
E)   dehydration

Question 13

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

Accepted Answer

A)   Sinoatrial (S
A)  node → atrioventricular (AV) bundle → atrioventricular (AV) node → Subendothelial conducting network → cardiomyocyte in LV
B)   Atrioventricular (AV) node → subendothelial conducting network → atrioventricular (AV) bundle → sinoatrial (S
A)  node → cardiomyocyte in LV
C)   Atrioventricular (AV) node → sinoatrial (S
A)  node → atrioventricular (AV) bundle → Subendothelial conducting network → cardiomyocyte in LV
D)   Sinoatrial (S
A)  node → atrioventricular (AV) node → atrioventricular (AV) bundle → Subendothelial conducting network → cardiomyocyte in LV
E)   Sinoatrial (S
A)  node → atrioventricular (AV) node → Subendothelial conducting network → atrioventricular (AV) bundle → cardiomyocyte in LV

Question 14

The __________ provides most of the Ca2+ needed for myocardial contraction.

Accepted Answer

A)   extracellular fluid
B)   mitochondria
C)   sarcoplasmic reticulum
D)   Golgi apparatus
E)   cytoskeleton

Question 15

If the SA node is damaged,nodal rhythm is sufficient to sustain life.

Accepted Answer

A) True 
 B)False  True

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

Which of the following is not part of the cardiac conduction system?

Accepted Answer

A)   Sinoatrial (S
A)  node
B)   Tendinous cords
C)   Atrioventricular (AV) node
D)   Atrioventricular (AV) bundle (bundle of His) 
E)   Subendothelial conducting network

Question 18

The __________ valve regulates the flow of blood between the right ventricle and the vessels leading to the lungs.

Accepted Answer

A)   right atrioventricular
B)   left atrioventricular
C)   aortic
D)   pulmonary
E)   mitral

Question 19

The shallow depression seen on the external surface of the heart between the left and right ventricles is called the __________.

Accepted Answer

A)   coronary sinus
B)   interventricular sulcus
C)   interventricular septum
D)   coronary sulcus
E)   left atrium

Question 20

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 valves A

Exam 19: The Circulatory System: Heart

Which of the following is the most superficial layer enclosing the heart?

Correct AnswerverifiedShow Answer

Cardioinhibitory centers in the __________ receive input from __________.

Correct AnswerverifiedShow Answer

The __________ carry blood toward the lungs.

Correct AnswerverifiedShow Answer

The cardiac plexus and cardiac nerves dominate the innervation of the heart and contains both parasympathetic and sympathetic fibers.

Correct AnswerverifiedShow Answer

An extended period of time between the P wave and the QRS complex may indicate which of the following?

Correct AnswerverifiedA

The long plateau in the action potential observed in cardiomyocytes is probably related with __________ staying longer in the cytosol.

Correct AnswerverifiedShow Answer

Most of the ventricle filling occurs __________.

Correct AnswerverifiedShow Answer

Obstruction of the ___________ will cause a more severe myocardial infarction (MI) than the obstruction of any of the others.

Correct AnswerverifiedShow Answer

Which of the following blood vessels receives blood directly from the right ventricle?

Correct AnswerverifiedShow Answer

The heart is located in the space called the __________.

Correct AnswerverifiedShow Answer

Hypercapnia and acidosis have positive chronotropic effects.

Correct AnswerverifiedShow Answer

Stroke volume is increased by __________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The __________ provides most of the Ca2+ needed for myocardial contraction.

Correct AnswerverifiedShow Answer

If the SA node is damaged,nodal rhythm is sufficient to sustain life.

Correct AnswerverifiedTrue

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

Correct AnswerverifiedShow Answer

Which of the following is not part of the cardiac conduction system?

Correct AnswerverifiedShow Answer

The __________ valve regulates the flow of blood between the right ventricle and the vessels leading to the lungs.

Correct AnswerverifiedShow Answer

The shallow depression seen on the external surface of the heart between the left and right ventricles is called the __________.

Correct AnswerverifiedShow Answer

Oxygen-poor blood passes through the _________.

Correct AnswerverifiedA

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The __________ provides most of the Ca²⁺ needed for myocardial contraction.

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