Question 1

Referring to the ECG,the P wave represents

Accepted Answer

A)  atrial contraction. 
B)  ventricular relaxation. 
C)  atrial depolarization. 
D)  atrial repolarization. 
A)  atrial contraction. 
B)  ventricular relaxation. 
C)  atrial depolarization. 
D)  atrial repolarization. C

Question 2

Which of the following is true of the structures of the electrical conduction system?

Accepted Answer

A)  The AV valve is the pacemaker. 
B)  In normal sinus rhythm, the electrical signal arises within the SA node. 
C)  The His-Purkinje system spreads the electrical system from the right atrium to the left atrium. 
D)  The purpose of the AV node is to increase the speed at which the cardiac impulse moves from the atria to the ventricles. 
A)  The AV valve is the pacemaker. 
B)  In normal sinus rhythm, the electrical signal arises within the SA node. 
C)  The His-Purkinje system spreads the electrical system from the right atrium to the left atrium. 
D)  The purpose of the AV node is to increase the speed at which the cardiac impulse moves from the atria to the ventricles. B

Question 3

The semilunar valves

Accepted Answer

A)  receive blood from the contracting ventricles. 
B)  are anchored by chordae tendineae. 
C)  "see" only oxygenated blood. 
D)  "see" only unoxygenated blood. 
A)  receive blood from the contracting ventricles. 
B)  are anchored by chordae tendineae. 
C)  "see" only oxygenated blood. 
D)  "see" only unoxygenated blood. A

Question 4

What are the two phases of the ventricular action potential (cardiac impulse)?

Accepted Answer

A)  Systole and diastole 
B)  Filling and ejecting 
C)  Depolarization and repolarization 
D)  P wave and T wave 
A)  Systole and diastole 
B)  Filling and ejecting 
C)  Depolarization and repolarization 
D)  P wave and T wave

Question 5

Which layer of the heart allows it to act as a pump?

Accepted Answer

A)  Epicardium 
B)  Myocardium 
C)  Pericardium 
D)  Endocardium 
A)  Epicardium 
B)  Myocardium 
C)  Pericardium 
D)  Endocardium

Question 6

What causes S₁ and S₂?

Accepted Answer

A)  Closure of heart valves 
B)  Firing of the SA node 
C)  Opening of heart valves. 
D)  Movement of the cardiac impulse along the His-Purkinje fibers 
A)  Closure of heart valves 
B)  Firing of the SA node 
C)  Opening of heart valves. 
D)  Movement of the cardiac impulse along the His-Purkinje fibers

Question 7

What is the valvular response to the contraction of the ventricles?

Accepted Answer

A)  The AV valves open. 
B)  The semilunar valves close. 
C)  The pulmonic and aortic valves open. 
D)  The entrance valves open. 
A)  The AV valves open. 
B)  The semilunar valves close. 
C)  The pulmonic and aortic valves open. 
D)  The entrance valves open.

Question 8

Which of the following is true of the aorta?

Accepted Answer

A)  It distributes unoxygenated blood to the systemic circulation. 
B)  It distributes oxygenated blood to the pulmonic circulation. 
C)  It arises within the left ventricle. 
D)  It is color coded blue to indicate its degree of oxygen saturation. 
A)  It distributes unoxygenated blood to the systemic circulation. 
B)  It distributes oxygenated blood to the pulmonic circulation. 
C)  It arises within the left ventricle. 
D)  It is color coded blue to indicate its degree of oxygen saturation.

Question 9

Which of the following spaces does not contain the heart?

Accepted Answer

A)  Thoracic cavity 
B)  Ventral cavity 
C)  Dorsal cavity 
D)  Mediastinum 
A)  Thoracic cavity 
B)  Ventral cavity 
C)  Dorsal cavity 
D)  Mediastinum

Question 10

Which of the following is true about the left ventricular myocardium?

Accepted Answer

A)  Pumps blood into the pulmonary artery 
B)  Contraction is caused by the sliding of actin and myosin 
C)  Receives oxygenated blood from the precordium 
D)  Contains unoxygenated blood 
A)  Pumps blood into the pulmonary artery 
B)  Contraction is caused by the sliding of actin and myosin 
C)  Receives oxygenated blood from the precordium 
D)  Contains unoxygenated blood

Question 11

The aorta receives blood from the

Accepted Answer

A)  right ventricle. 
B)  pulmonary veins. 
C)  pulmonary artery. 
D)  left ventricle. 
A)  right ventricle. 
B)  pulmonary veins. 
C)  pulmonary artery. 
D)  left ventricle.

Question 12

Which of the following is least descriptive of the myocardium?

Accepted Answer

A)  Cardiac muscle composed of actin and myosin arranged in sarcomeres 
B)  Thicker in the ventricles than the atria 
C)  Thicker in the left ventricle than the right ventricle 
D)  Thicker in the left atrium than the right ventricle 
A)  Cardiac muscle composed of actin and myosin arranged in sarcomeres 
B)  Thicker in the ventricles than the atria 
C)  Thicker in the left ventricle than the right ventricle 
D)  Thicker in the left atrium than the right ventricle

Question 13

What is the hardest working cardiac chamber and therefore has the thickest myocardium?

Accepted Answer

A)  Right atrium 
B)  Right ventricle 
C)  Left atrium 
D)  Left ventricle 
A)  Right atrium 
B)  Right ventricle 
C)  Left atrium 
D)  Left ventricle

Question 14

Which of the following is a function of a valve?

Accepted Answer

A)  Regulates the direction of the flow of blood through the heart 
B)  Regulates the amount of oxygen bound to hemoglobin 
C)  Regulates heart rate 
D)  Directs the movement of the cardiac impulse 
A)  Regulates the direction of the flow of blood through the heart 
B)  Regulates the amount of oxygen bound to hemoglobin 
C)  Regulates heart rate 
D)  Directs the movement of the cardiac impulse

Question 15

Stenosis of which valve causes right ventricular hypertrophy?

Accepted Answer

A)  Mitral 
B)  Tricuspid 
C)  Right semilunar 
D)  Left semilunar 
A)  Mitral 
B)  Tricuspid 
C)  Right semilunar 
D)  Left semilunar

Question 16

Chordae tendineae are not associated with this valve.

Accepted Answer

A)  Aortic 
B)  Mitral 
C)  Tricuspid 
D)  Bicuspid 
A)  Aortic 
B)  Mitral 
C)  Tricuspid 
D)  Bicuspid

Question 17

Blood flows from the right atrium through which atrioventricular valve to the right ventricle?

Accepted Answer

A)  Bicuspid 
B)  Mitral 
C)  Pulmonic 
D)  Tricuspid 
A)  Bicuspid 
B)  Mitral 
C)  Pulmonic 
D)  Tricuspid

Question 18

Describe the valvular response to the relaxation of the right ventricle.

Accepted Answer

A)  The tricuspid valve opens 
B)  The right AV snaps closed 
C)  The pulmonic valve opens 
D)  The semilunar valve in the right heart opens 
A)  The tricuspid valve opens 
B)  The right AV snaps closed 
C)  The pulmonic valve opens 
D)  The semilunar valve in the right heart opens

Question 19

Initially a child with a ventricular septal defect (VSD)and pulmonic valve stenosis is acyanotic.Over time,however,the pulmonic valve stenosis worsens and the child becomes cyanotic.What is the most probable explanation?

Accepted Answer

A)  The child becomes severely anemic and hypoxemic. 
B)  The pulmonic stenosis elevates right ventricular pressure, thereby shunting unoxygenated blood from the right ventricle into the left ventricle; unoxygenated blood is then pumped to the systemic circulation. 
C)  Blood is shunted from the left ventricle into the right ventricle. 
D)  Excess blood in the right ventricle and pulmonary artery fills the alveoli, thereby causing hypoxemia and cyanosis. 
A)  The child becomes severely anemic and hypoxemic. 
B)  The pulmonic stenosis elevates right ventricular pressure, thereby shunting unoxygenated blood from the right ventricle into the left ventricle; unoxygenated blood is then pumped to the systemic circulation. 
C)  Blood is shunted from the left ventricle into the right ventricle. 
D)  Excess blood in the right ventricle and pulmonary artery fills the alveoli, thereby causing hypoxemia and cyanosis.

Question 20

Cells that spontaneously depolarize from resting membrane potential to threshold potential

Accepted Answer

A)  are called pacemaker cells. 
B)  normally "live" within the chordae tendineae. 
C)  are restricted to the SA node. 
D)  are stored within the pericardium. 
A)  are called pacemaker cells. 
B)  normally "live" within the chordae tendineae. 
C)  are restricted to the SA node. 
D)  are stored within the pericardium.

Exam 16: Anatomy of the Heart

Referring to the ECG,the P wave represents

Which of the following is true of the structures of the electrical conduction system?

The semilunar valves

What are the two phases of the ventricular action potential (cardiac impulse)?

Which layer of the heart allows it to act as a pump?

What causes S₁ and S₂?

What is the valvular response to the contraction of the ventricles?

Which of the following is true of the aorta?

Which of the following spaces does not contain the heart?

Which of the following is true about the left ventricular myocardium?

The aorta receives blood from the

Which of the following is least descriptive of the myocardium?

What is the hardest working cardiac chamber and therefore has the thickest myocardium?

Which of the following is a function of a valve?

Stenosis of which valve causes right ventricular hypertrophy?

Chordae tendineae are not associated with this valve.

Blood flows from the right atrium through which atrioventricular valve to the right ventricle?

Describe the valvular response to the relaxation of the right ventricle.

Initially a child with a ventricular septal defect (VSD)and pulmonic valve stenosis is acyanotic.Over time,however,the pulmonic valve stenosis worsens and the child becomes cyanotic.What is the most probable explanation?

Cells that spontaneously depolarize from resting membrane potential to threshold potential

Introduction to the Human Body

Basic Chemistry

Cells

Cell Metabolism

Microbiology Basics

Tissues and Membranes

Integumentary System and Body Temperature

Skeletal System

Muscular System

Nervous System: Nervous Tissue and Brain

Nervous System: Spinal Cord and Peripheral Nerves

Autonomic Nervous System

Sensory System

Endocrine System

Blood

Function of the Heart

Anatomy of the Blood Vessels

Functions of the Blood Vessels

Lymphatic System

Immune System

Respiratory System

Digestive System

Urinary System

Water, Electrolyte, and Acid-Base Balance

Reproductive Systems

Human Development and Heredity

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