Question 1

The marginal branch and posterior interventricular branch are branches of the

Accepted Answer

A) right coronary artery. 
B) left coronary artery. 
C) circumflex artery. 
D) coronary sinus. 
E) aorta. 
A) right coronary artery. 
B) left coronary artery. 
C) circumflex artery. 
D) coronary sinus. 
E) aorta.

Question 2

If a patient's resting cardiac output is 5.6 l/min and on a stress test she elevated her heart rate to a maximum of 176 beats/min with a stroke volume of 115 ml/beat,what is her cardiac reserve? Show your work.

Accepted Answer

Cardiac reserve equals maximum

Question 3

Pacemaker cells isolated from the SA node generate action potentials at ________ beats per minute.

Accepted Answer

A) 20-40 
B) 40-60 
C) 80-100 
D) 100-140 
E) 140-180 
A) 20-40 
B) 40-60 
C) 80-100 
D) 100-140 
E) 140-180

Question 4

When the left ventricle contracts,the distance from the apex to the base

Accepted Answer

A) increases. 
B) decreases. 
C) remains unchanged. 
A) increases. 
B) decreases. 
C) remains unchanged.

Question 5

The relaxation phase of the cardiac cycle is called

Accepted Answer

A) depolarization. 
B) systole. 
C) diastole. 
D) hyperpolarization. 
E) asystole. 
A) depolarization. 
B) systole. 
C) diastole. 
D) hyperpolarization. 
E) asystole.

Question 6

The foramen ovale in the fetal heart is located in the

Accepted Answer

A) right atrium. 
B) left atrium. 
C) right ventricle. 
D) left ventricle. 
E) interatrial septum. 
A) right atrium. 
B) left atrium. 
C) right ventricle. 
D) left ventricle. 
E) interatrial septum.

Question 7

Depolarization of the atria corresponds to the EKG's

Accepted Answer

A) P wave. 
B) QRS complex. 
C) QT interval. 
D) T wave. 
E) S-T segment. 
A) P wave. 
B) QRS complex. 
C) QT interval. 
D) T wave. 
E) S-T segment.

Question 8

The term used to describe fluid collecting in the pericardial cavity that restricts the movement of the heart is known as

Accepted Answer

A) cardiac tamponade. 
B) mitral valve prolapse. 
C) pleural effusion. 
D) cardiomyopathy. 
E) pericarditis. 
A) cardiac tamponade. 
B) mitral valve prolapse. 
C) pleural effusion. 
D) cardiomyopathy. 
E) pericarditis.

Question 9

Coronary veins empty into the

Accepted Answer

A) left atrium. 
B) left ventricle. 
C) right atrium. 
D) right ventricle. 
E) conus arteriosus. 
A) left atrium. 
B) left ventricle. 
C) right atrium. 
D) right ventricle. 
E) conus arteriosus.

Question 10

The ________ is shared by the two ventricles.

Accepted Answer

A) vena cava 
B) bicuspid valve 
C) chordate tendinae 
D) interventricular septum 
E) trabeculae 
A) vena cava 
B) bicuspid valve 
C) chordate tendinae 
D) interventricular septum 
E) trabeculae

Question 11

Which of the following would increase heart rate?

Accepted Answer

A) increased sympathetic stimulation of SA node 
B) decreased parasympathetic stimulation of nodal fibers 
C) increased levels of epinephrine 
D) faster depolarization of the pacemaker potential 
E) All of the answers are correct. 
A) increased sympathetic stimulation of SA node 
B) decreased parasympathetic stimulation of nodal fibers 
C) increased levels of epinephrine 
D) faster depolarization of the pacemaker potential 
E) All of the answers are correct.

Question 12

The first heart sound is heard when the

Accepted Answer

A) AV valves open. 
B) AV valves close. 
C) semilunar valves close. 
D) atria contract. 
E) blood enters the aorta. 
A) AV valves open. 
B) AV valves close. 
C) semilunar valves close. 
D) atria contract. 
E) blood enters the aorta.

Question 13

A patient's ECG recording shows a very long P-R interval.What is the cause of this abnormal wave pattern?

Accepted Answer

The P wave marks the time of atrial depo

Question 14

In the middle of the thoracic cavity is a region occupied by the heart,great vessels,thymus,esophagus,and trachea called the

Accepted Answer

A) pleural space. 
B) pericardial space. 
C) mediastinum. 
D) cardiac notch. 
E) ventral cavity. 
A) pleural space. 
B) pericardial space. 
C) mediastinum. 
D) cardiac notch. 
E) ventral cavity.

Question 15

The connective tissue fibers of the myocardium

Accepted Answer

A) add strength and prevent overexpansion of the heart. 
B) help distribute the forces of contraction. 
C) provide elasticity to help return the heart to its normal size. 
D) provide physical support for cardiac muscle. 
E) All of the answers are correct. 
A) add strength and prevent overexpansion of the heart. 
B) help distribute the forces of contraction. 
C) provide elasticity to help return the heart to its normal size. 
D) provide physical support for cardiac muscle. 
E) All of the answers are correct.

Question 16

Cardiac cells damaged by infarction will show which of the following?

Accepted Answer

A) switch to anaerobic metabolism 
B) release of enzymes into the circulation 
C) release of troponin T and I into the circulation 
D) release of CK-MB into the circulation 
E) All of the answers are correct. 
A) switch to anaerobic metabolism 
B) release of enzymes into the circulation 
C) release of troponin T and I into the circulation 
D) release of CK-MB into the circulation 
E) All of the answers are correct.

Question 17

The following are structural components of the conducting system of the heart.
1)Purkinje fibers
2)AV bundle
3)AV node
4)SA node
5)bundle branches
The sequence in which excitation would move through this system is

Accepted Answer

A) 1,4,3,2,5. 
B) 3,2,4,5,1. 
C) 3,5,4,2,1. 
D) 4,3,2,5,1. 
E) 4,2,3,5,1. 
A) 1,4,3,2,5. 
B) 3,2,4,5,1. 
C) 3,5,4,2,1. 
D) 4,3,2,5,1. 
E) 4,2,3,5,1.

Question 18

Calculate cardiac output if the heart rate is 125 beats/minute,the end-diastolic volume is 130 ml,and the end-systolic volume is 40 ml.

Accepted Answer

A) 21,250 ml / min 
B) 16,250 ml / min 
C) 11,250 ml / min 
D) 195 ml / min 
E) 200 ml / min 
A) 21,250 ml / min 
B) 16,250 ml / min 
C) 11,250 ml / min 
D) 195 ml / min 
E) 200 ml / min

Question 19

Figure 20-2 Cardiac Cycle
Use Figure 20-2 to answer the following questions:
-What volume is labeled "E" on the graph?

Accepted Answer

A) cardiac output 
B) stroke volume 
C) end-diastolic volume 
D) end-systolic volume 
E) total cardiac volume 
A) cardiac output 
B) stroke volume 
C) end-diastolic volume 
D) end-systolic volume 
E) total cardiac volume

Question 20

The heart is innervated by ________ nerves.

Accepted Answer

A) parasympathetic 
B) sympathetic 
C) both parasympathetic and sympathetic 
D) neither parasympathetic nor sympathetic 
E) somatomotor 
A) parasympathetic 
B) sympathetic 
C) both parasympathetic and sympathetic 
D) neither parasympathetic nor sympathetic 
E) somatomotor

Exam 20: The Heart

The marginal branch and posterior interventricular branch are branches of the

If a patient's resting cardiac output is 5.6 l/min and on a stress test she elevated her heart rate to a maximum of 176 beats/min with a stroke volume of 115 ml/beat,what is her cardiac reserve? Show your work.

Pacemaker cells isolated from the SA node generate action potentials at ________ beats per minute.

When the left ventricle contracts,the distance from the apex to the base

The relaxation phase of the cardiac cycle is called

The foramen ovale in the fetal heart is located in the

Depolarization of the atria corresponds to the EKG's

The term used to describe fluid collecting in the pericardial cavity that restricts the movement of the heart is known as

Coronary veins empty into the

The ________ is shared by the two ventricles.

Which of the following would increase heart rate?

The first heart sound is heard when the

A patient's ECG recording shows a very long P-R interval.What is the cause of this abnormal wave pattern?

In the middle of the thoracic cavity is a region occupied by the heart,great vessels,thymus,esophagus,and trachea called the

The connective tissue fibers of the myocardium

Cardiac cells damaged by infarction will show which of the following?

The following are structural components of the conducting system of the heart. 1)Purkinje fibers 2)AV bundle 3)AV node 4)SA node 5)bundle branches The sequence in which excitation would move through this system is

Calculate cardiac output if the heart rate is 125 beats/minute,the end-diastolic volume is 130 ml,and the end-systolic volume is 40 ml.

Figure 20-2 Cardiac Cycle Use Figure 20-2 to answer the following questions: -What volume is labeled "E" on the graph?

The heart is innervated by ________ nerves.

An Introduction to Anatomy and Physiology

The Chemical Level of Organization

The Cellular Level of Organization

The Tissue Level of Organization

The Integumentary System

Osseous Tissue and Bone Structure

The Axial Skeleton

The Appendicular Skeleton

Joints

Muscle Tissue

The Muscular System

Neural Tissue

The Spinal Cord, spinal Nerves, and Spinal Reflexes

The Brain and Cranial Nerves

Sensory Pathways and the Somatic Nervous System

The Autonomic Nervous System and Higher-Order Functions

The Special Senses

The Endocrine System

Blood

Blood Vessels and Circulation

The Lymphatic System and Immunity

The Respiratory System

The Digestive System

Metabolism and Energetics

The Urinary System

Fluid, electrolyte, and Acid-Base Balance

The Reproductive System

Development and Inheritance

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