Question 1

Why is the myocardium of the left ventricle thicker than the myocardium of the right ventricle?

Accepted Answer

The left ventricle muscular wall is thic

Question 2

Which labeled structure in the figure represents the only potential pathway for conducting action potentials from the atria to the ventricles?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
E) E 
A) A 
B) B 
C) C 
D) D 
E) E

Question 3

The volume of blood ejected from the left ventricle into the aorta each minute is called the

Accepted Answer

A) cardiac output. 
B) cardiac input. 
C) stroke volume. 
D) heart rate. 
E) pulse pressure. 
A) cardiac output. 
B) cardiac input. 
C) stroke volume. 
D) heart rate. 
E) pulse pressure.

Question 4

Which wave in an electrocardiogram represents repolarization of the ventricles?

Accepted Answer

A) R wave 
B) T wave 
C) S wave 
D) P wave 
E) Q wave 
A) R wave 
B) T wave 
C) S wave 
D) P wave 
E) Q wave

Question 5

Briefly describe what is happening at stage of the ECG labeled 5 in the diagram.

Accepted Answer

The contractile fibers of the

Question 6

Which labeled blood vessel in the diagram is an artery carrying deoxygenated blood?

Accepted Answer

A) A 
B) B 
C) C 
D) E 
E) I 
A) A 
B) B 
C) C 
D) E 
E) I

Question 7

Blood leaving the left ventricle passes through which of the following structures?

Accepted Answer

A) Right atrium 
B) Interventricular septum 
C) Bicuspid valve 
D) Aortic semilunar valve 
E) Pulmonary semilunar valve 
A) Right atrium 
B) Interventricular septum 
C) Bicuspid valve 
D) Aortic semilunar valve 
E) Pulmonary semilunar valve

Question 8

In the diagram,where are the trabeculae carneae?

Accepted Answer

A) D 
B) E 
C) F 
D) G 
E) H 
A) D 
B) E 
C) F 
D) G 
E) H

Question 9

What is the function of the foramen ovale during fetal life?

Accepted Answer

A) Allowing blood to flow directly from the right atrium into the left atrium. 
B) Allowing blood to flow directly from the right ventricle into the left ventricle. 
C) Serves as a valve in the vena cava to regulate venous blood flow. 
D) Prevents back flow of blood from aorta into the left ventricle. 
E) Prevents back flow of blood from pulmonary trunk into the right ventricle. 
A) Allowing blood to flow directly from the right atrium into the left atrium. 
B) Allowing blood to flow directly from the right ventricle into the left ventricle. 
C) Serves as a valve in the vena cava to regulate venous blood flow. 
D) Prevents back flow of blood from aorta into the left ventricle. 
E) Prevents back flow of blood from pulmonary trunk into the right ventricle.

Question 10

Which of the following blood vessel is used to distribute oxygenated blood to the myocardium?

Accepted Answer

A) Coronary artery 
B) Coronary vein 
C) Coronary sinus 
D) Vena cava 
E) Myocardial vein 
A) Coronary artery 
B) Coronary vein 
C) Coronary sinus 
D) Vena cava 
E) Myocardial vein

Question 11

Identify the groove found on the surface of the heart and marks the boundary between the right and left ventricles.

Accepted Answer

A) Coronary sulcus 
B) Anterior interventricular sulcus 
C) Posterior interventricular sulcus 
D) Coronary sinus 
E) Anterior intraventricular sulcus 
A) Coronary sulcus 
B) Anterior interventricular sulcus 
C) Posterior interventricular sulcus 
D) Coronary sinus 
E) Anterior intraventricular sulcus

Question 12

Which labeled structure in the figure carries the cardiac action potential directly into the contractile fibers of the ventricular myocardium?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
E) E 
A) A 
B) B 
C) C 
D) D 
E) E

Question 13

Which of the following is used to reduce friction between the layers of membranes surrounding the heart?

Accepted Answer

A) Synovial fluid 
B) Endocardium 
C) Pleural fluid 
D) Pericardial fluid 
E) Capillary endothelium 
A) Synovial fluid 
B) Endocardium 
C) Pleural fluid 
D) Pericardial fluid 
E) Capillary endothelium

Question 14

Explain how the heart pumps blood into two separate closed circuits that are arranged in series.

Accepted Answer

The two circuits are the pulmonary and s

Question 15

Contraction of the atria of the heart leads to blood moving directly

Accepted Answer

A) into auricles. 
B) into arteries. 
C) into veins 
D) through atrioventricular valves 
E) through semilunar valves. 
A) into auricles. 
B) into arteries. 
C) into veins 
D) through atrioventricular valves 
E) through semilunar valves.

Question 16

Which of the labeled diagrams shows coarctation of the aorta?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
E) E 
A) A 
B) B 
C) C 
D) D 
E) E

Question 17

Which labeled structure in the figure acts as the natural pacemaker of the heart?

Accepted Answer

A) A 
B) B 
C) C 
D) D 
E) E 
A) A 
B) B 
C) C 
D) D 
E) E

Question 18

In comparison to skeletal muscle fibers,the contractile fibers of the heart are depolarized for _____ period of time.

Accepted Answer

A) a shorter 
B) a longer 
C) the same 
A) a shorter 
B) a longer 
C) the same

Question 19

Which of the following would lead to a decreased heart rate?

Accepted Answer

A) Increased norepinephrine release 
B) Increased thyroid hormone release 
C) Increased potassium levels in plasma 
D) Increased calcium levels in plasma 
E) Increased sympathetic stimulation 
A) Increased norepinephrine release 
B) Increased thyroid hormone release 
C) Increased potassium levels in plasma 
D) Increased calcium levels in plasma 
E) Increased sympathetic stimulation

Question 20

Which structure in the figure is labeled B?

Accepted Answer

A) left common carotid artery 
B) left subclavian artery 
C) left pulmonary vein 
D) mitral valve 
A) left common carotid artery 
B) left subclavian artery 
C) left pulmonary vein 
D) mitral valve

Exam 20: The Cardiovascular System: the Heart

Why is the myocardium of the left ventricle thicker than the myocardium of the right ventricle?

Which labeled structure in the figure represents the only potential pathway for conducting action potentials from the atria to the ventricles?

The volume of blood ejected from the left ventricle into the aorta each minute is called the

Which wave in an electrocardiogram represents repolarization of the ventricles?

Briefly describe what is happening at stage of the ECG labeled 5 in the diagram.

Which labeled blood vessel in the diagram is an artery carrying deoxygenated blood?

Blood leaving the left ventricle passes through which of the following structures?

In the diagram,where are the trabeculae carneae?

What is the function of the foramen ovale during fetal life?

Which of the following blood vessel is used to distribute oxygenated blood to the myocardium?

Identify the groove found on the surface of the heart and marks the boundary between the right and left ventricles.

Which labeled structure in the figure carries the cardiac action potential directly into the contractile fibers of the ventricular myocardium?

Which of the following is used to reduce friction between the layers of membranes surrounding the heart?

Explain how the heart pumps blood into two separate closed circuits that are arranged in series.

Contraction of the atria of the heart leads to blood moving directly

Which of the labeled diagrams shows coarctation of the aorta?

Which labeled structure in the figure acts as the natural pacemaker of the heart?

In comparison to skeletal muscle fibers,the contractile fibers of the heart are depolarized for _____ period of time.

Which of the following would lead to a decreased heart rate?

Which structure in the figure is labeled B?

An Introduction to the Human Body

The Chemical Level of Organization

The Cellular Level of Organization

The Tissue Level of Organization

The Integumentary System Unit Ii: Principles of Support and Movement

The Skeletal System: Bone Tissue

The Skeletal System: the Axial Skeleton

The Skeletal System: the Appendicular Skeleton

Joints

Muscle Tissue

The Muscular System Unit Iii: Control Systems of the Human Body

Nervous Tissue

The Spinal Cord and Spinal Nerves

The Brain and Cranial Nerves

The Autonomic Nervous System

Sensory, Motor and Integrative Systems

The Special Senses

The Endocrine System Unit Iv: Maintenance of the Human Body

The Cardiovascular System: the Blood

The Cardiovascular System: Blood Vessels and Hemodynamics

The Lymphatic System, Nonspecific Resistance to Disease, and Immunity

The Respiratory System

The Digestive System

Metabolism

The Urinary System

Fluid, Electrolyte, and Acid-Base Homeostasis Unit V: Continuity

The Reproductive Systems

Development and Inheritance

Filters