Question 1

What abnormal heart rhythm could be caused by an elevated body temperature, excessive sympathetic stimulation, or toxic conditions?

Accepted Answer

A)  bradycardia 
B)  atrial fibrillation 
C)  second-degree AV node block 
D)  tachycardia 
A)  bradycardia 
B)  atrial fibrillation 
C)  second-degree AV node block 
D)  tachycardia

Question 2

Cardiac muscle cells

Accepted Answer

A)  have smooth ER but no T tubules. 
B)  form the heart valves. 
C)  are maintained by an extensive capillary network. 
D)  develop a significant oxygen debt during systole. 
E)  do not contain actin and myosin like skeletal muscle cells. 
A)  have smooth ER but no T tubules. 
B)  form the heart valves. 
C)  are maintained by an extensive capillary network. 
D)  develop a significant oxygen debt during systole. 
E)  do not contain actin and myosin like skeletal muscle cells.

Question 3

-Blood from the pulmonary veins is entering this chamber of the heart.

Accepted Answer

The answer of  
-Blood from the pulmonary veins is...

Question 4

Increased vagal stimulation would cause

Accepted Answer

A)  the heart rate to decrease. 
B)  the heart rate to increase. 
C)  force of contraction to increase. 
D)  stroke volume to increase. 
E)  no change in heart rate, stroke volume, or force of contraction. 
A)  the heart rate to decrease. 
B)  the heart rate to increase. 
C)  force of contraction to increase. 
D)  stroke volume to increase. 
E)  no change in heart rate, stroke volume, or force of contraction.

Question 5

The epicardium

Accepted Answer

A)  covers the surface of the heart. 
B)  lines the walls of the ventricles. 
C)  is known as the fibrous pericardium. 
D)  attaches inferiorly to the diaphragm. 
E)  is also called endocardium. 
A)  covers the surface of the heart. 
B)  lines the walls of the ventricles. 
C)  is known as the fibrous pericardium. 
D)  attaches inferiorly to the diaphragm. 
E)  is also called endocardium.

Question 6

-Blood exiting the aortic semilunar valve is leaving this chamber of the heart.

Accepted Answer

The answer of  
-Blood exiting the aortic semilunar valve...

Question 7

The period of time in which the myocardium is insensitive to further stimulation is called the

Accepted Answer

A)  absolute refractory period. 
B)  hyperpolarization period. 
C)  AV period. 
D)  SA period. 
E)  ectopic focus. 
A)  absolute refractory period. 
B)  hyperpolarization period. 
C)  AV period. 
D)  SA period. 
E)  ectopic focus.

Question 8

The tricuspid valve is closed

Accepted Answer

A)  during active filling of the ventricles. 
B)  when the mitral valve is open. 
C)  while the atria are contracting. 
D)  during ejection. 
E)  during passive filling of the ventricles. 
A)  during active filling of the ventricles. 
B)  when the mitral valve is open. 
C)  while the atria are contracting. 
D)  during ejection. 
E)  during passive filling of the ventricles.

Question 9

Which of the following statements regarding intrinsic regulation of the heart is true?

Accepted Answer

A)  Stretching the SA node will decrease generation of action potentials in the node. 
B)  Decreased venous return increases cardiac output. 
C)  The heart's pumping effectiveness is greatly influenced by small changes in afterload. 
D)  If cardiac muscle fibers are slightly stretched, they have a stronger contraction force. 
E)  If cardiac muscle fibers are slightly stretched, they have a weaker contraction force. 
A)  Stretching the SA node will decrease generation of action potentials in the node. 
B)  Decreased venous return increases cardiac output. 
C)  The heart's pumping effectiveness is greatly influenced by small changes in afterload. 
D)  If cardiac muscle fibers are slightly stretched, they have a stronger contraction force. 
E)  If cardiac muscle fibers are slightly stretched, they have a weaker contraction force.

Question 10

If the SA node is nonfunctional, which of the following is most likely to occur?

Accepted Answer

A)  The heart will go into asystole (stop). 
B)  Tachycardia will develop. 
C)  Another portion of the heart will become the pacemaker. 
D)  The heart will go into defibrillation. 
E)  The heart will be desensitized. 
A)  The heart will go into asystole (stop). 
B)  Tachycardia will develop. 
C)  Another portion of the heart will become the pacemaker. 
D)  The heart will go into defibrillation. 
E)  The heart will be desensitized.

Question 11

Pressure in the right ventricle must exceed pressure in the ____ before the right ventricle can eject blood.

Accepted Answer

A)  superior vena cava 
B)  coronary sinus 
C)  pulmonary trunk 
D)  aorta 
E)  pulmonary veins. 
A)  superior vena cava 
B)  coronary sinus 
C)  pulmonary trunk 
D)  aorta 
E)  pulmonary veins.

Question 12

Which of the following is true?

Accepted Answer

A)  Blood enters the right and left atria only during diastole. 
B)  Most ventricular filling occurs before the atria contract. 
C)  During ventricular systole, the AV valves open. 
D)  The semilunar valves remain closed throughout ventricular systole. 
E)  Most of end-diastolic volume comes from active filling. 
A)  Blood enters the right and left atria only during diastole. 
B)  Most ventricular filling occurs before the atria contract. 
C)  During ventricular systole, the AV valves open. 
D)  The semilunar valves remain closed throughout ventricular systole. 
E)  Most of end-diastolic volume comes from active filling.

Question 13

The volume of blood pumped during each cardiac cycle is the

Accepted Answer

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

Question 14

Match the blood vessel with the appropriate description.
-superior vena cava

Accepted Answer

A) returns blood to the heart from the lower extremities 
B) returns blood to the heart from the lungs 
C) carries blood from the left ventricle into systemic circulation 
D) returns blood to the heart from the head and neck 
E) carries blood from the right ventricle to the lungs 
A) returns blood to the heart from the lower extremities 
B) returns blood to the heart from the lungs 
C) carries blood from the left ventricle into systemic circulation 
D) returns blood to the heart from the head and neck 
E) carries blood from the right ventricle to the lungs

Question 15

Use the following two choices:
-$\uparrow$ or $\downarrow$ in ECF K+ levels

Accepted Answer

A) ↑ heart rate 
B) ↓ heart rate 
A) ↑ heart rate 
B) ↓ heart rate

Question 16

Which of the following will depolarize immediately after the AV node depolarizes?

Accepted Answer

A)  the AV bundle 
B)  Purkinje fibers 
C)  atrial myocardium 
D)  bundle branches in the ventricular septum 
E)  the SA node 
A)  the AV bundle 
B)  Purkinje fibers 
C)  atrial myocardium 
D)  bundle branches in the ventricular septum 
E)  the SA node

Question 17

The pericardial sac is lined with

Accepted Answer

A)  fibrous pericardium. 
B)  parietal pericardium. 
C)  visceral pericardium. 
D)  myocardium. 
E)  epicardium. 
A)  fibrous pericardium. 
B)  parietal pericardium. 
C)  visceral pericardium. 
D)  myocardium. 
E)  epicardium.

Question 18

Use the following two choices:
-sympathetic stimulation of the heart

Accepted Answer

A) ↑ heart rate 
B) ↓ heart rate 
A) ↑ heart rate 
B) ↓ heart rate

Question 19

Ventricular contraction begins at the

Accepted Answer

A)  AV bundle. 
B)  apex of the heart. 
C)  base of the heart. 
D)  superior portion of the interventricular septum. 
E)  top of the ventricles. 
A)  AV bundle. 
B)  apex of the heart. 
C)  base of the heart. 
D)  superior portion of the interventricular septum. 
E)  top of the ventricles.

Question 20

In a physiology lab, the students designed an experiment to illustrate how the heart responds to changes in blood pressure. Everyone relaxed and then did a headstand. Which of the following observations are consistent with the change in the function of their hearts?

Accepted Answer

A)  increased heart rate 
B)  decreased heart rate 
C)  increased stroke volume 
D)  decreased stroke volume 
E)  both decreased heart rate and increased stroke volume 
A)  increased heart rate 
B)  decreased heart rate 
C)  increased stroke volume 
D)  decreased stroke volume 
E)  both decreased heart rate and increased stroke volume

Exam 20: Cardiovascular System: the Heart

What abnormal heart rhythm could be caused by an elevated body temperature, excessive sympathetic stimulation, or toxic conditions?

Cardiac muscle cells

-Blood from the pulmonary veins is entering this chamber of the heart.

Increased vagal stimulation would cause

The epicardium

-Blood exiting the aortic semilunar valve is leaving this chamber of the heart.

The period of time in which the myocardium is insensitive to further stimulation is called the

The tricuspid valve is closed

Which of the following statements regarding intrinsic regulation of the heart is true?

If the SA node is nonfunctional, which of the following is most likely to occur?

Pressure in the right ventricle must exceed pressure in the ____ before the right ventricle can eject blood.

Which of the following is true?

The volume of blood pumped during each cardiac cycle is the

Match the blood vessel with the appropriate description. -superior vena cava

Use the following two choices: - ↑\uparrow↑ or ↓\downarrow↓ in ECF K+ levels

Which of the following will depolarize immediately after the AV node depolarizes?

The pericardial sac is lined with

Use the following two choices: -sympathetic stimulation of the heart

Ventricular contraction begins at the

In a physiology lab, the students designed an experiment to illustrate how the heart responds to changes in blood pressure. Everyone relaxed and then did a headstand. Which of the following observations are consistent with the change in the function of their hearts?

The Human Organism

The Chemical Basis of Life

Cell Biology

Tissues

Integumentary System

Skeletal System: Bones and Bone Tissue

Skeletal System: Gross Anatomy

Joints and Movement

Muscular System: Histology and Physiology

Muscular System: Gross Anatomy

Functional Organization of Nervous Tissue

Spinal Cord and Spinal Nerves

Brain and Cranial Nerves

Integration of Nervous System Functions

The Special Senses

Autonomic Nervous System

Functional Organization of the Endocrine System

Endocrine Glands

Cardiovascular System: Blood

Cardiovascular System: Blood Vessels and Circulation

Lymphatic System and Immunity

Respiratory System

Digestive System

Nutrition, Metabolism, and Temperature Regulation

Urinary System

Water, Electrolytes, and Acidbase Balance

Reproductive System

Development, Growth, Aging, and Genetics

Filters

Use the following two choices: - $\uparrow$ or $\downarrow$ in ECF K⁺ levels