Question 1

To initiate a cardiac muscle cell contraction, calcium

Accepted Answer

A)  binds to calmodulin. 
B)  binds to troponin. 
C)  binds to actin. 
D)  binds to the Z-disc. 
E)  binds to tropomyosin. 
A)  binds to calmodulin. 
B)  binds to troponin. 
C)  binds to actin. 
D)  binds to the Z-disc. 
E)  binds to tropomyosin. B

Question 2

How many half-moon shaped, pocketlike cusps are found in each semilunar valve?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  6 
A)  1 
B)  2 
C)  3 
D)  4 
E)  6 C

Question 3

Which vein drains the posterior aspect of the ventricles of the heart?

Accepted Answer

A)  Great cardiac vein 
B)  Middle cardiac vein 
C)  Small cardiac vein 
D)  Circumflex vein 
A)  Great cardiac vein 
B)  Middle cardiac vein 
C)  Small cardiac vein 
D)  Circumflex vein B

Question 4

Parasympathetic and sympathetic influence on heart rate is controlled by reflexes.

Accepted Answer

A) True 
 B)False

Question 5

Each of the receiving chambers of the heart has a wrinkled flaplike extension; the one that is more visible from an anterior view is the

Accepted Answer

A)  interatrial septum. 
B)  interventricular septum. 
C)  left auricle. 
D)  right auricle. 
A)  interatrial septum. 
B)  interventricular septum. 
C)  left auricle. 
D)  right auricle.

Question 6

What part of the cardiac conduction system is located in the posterior wall of the right atrium, adjacent to the entrance of the superior vena cava?

Accepted Answer

A)  AV bundle 
B)  Bundle branches 
C)  Purkinje fibers 
D)  AV node 
E)  SA node 
A)  AV bundle 
B)  Bundle branches 
C)  Purkinje fibers 
D)  AV node 
E)  SA node

Question 7

The posterior interventricular artery is a branch off of the

Accepted Answer

A)  superior vena cava. 
B)  left marginal artery. 
C)  right coronary artery. 
D)  left coronary artery. 
E)  coronary sinus. 
A)  superior vena cava. 
B)  left marginal artery. 
C)  right coronary artery. 
D)  left coronary artery. 
E)  coronary sinus.

Question 8

Which correctly describes the heart's apex?

Accepted Answer

A)  Projects slightly anteroinferiorly toward the left side of the body 
B)  Projects slightly anteroinferiorly toward the right side of the body 
C)  Projects slightly posteroinferiorly toward the left side of the body 
D)  Projects slightly posteroinferiorly toward the right side of the body 
E)  Projects slightly posteroinferiorly toward the midline of the body 
A)  Projects slightly anteroinferiorly toward the left side of the body 
B)  Projects slightly anteroinferiorly toward the right side of the body 
C)  Projects slightly posteroinferiorly toward the left side of the body 
D)  Projects slightly posteroinferiorly toward the right side of the body 
E)  Projects slightly posteroinferiorly toward the midline of the body

Question 9

Blood flow to the heart wall courses through coronary vessels in a steady stream.

Accepted Answer

A) True 
 B)False

Question 10

Which are differences between cardiac muscle tissue and skeletal muscle tissue?
A: The sarcoplasmic reticulum in cardiac muscle is less extensive.
B: The sarcoplasmic reticulum in cardiac muscle is more organized.
C: Cardiac muscle has intercalated discs; skeletal muscle does not.
D: Cardiac muscle has 1 or 2 nuclei per cell; skeletal muscle has multiple nuclei per cell.
E: Cardiac muscle has more well-defined terminal cisternae.

Accepted Answer

A)  a, c, d 
B)  a, c, e 
C)  b, c, e 
D)  a, b, e 
E)  b, d, e 
A)  a, c, d 
B)  a, c, e 
C)  b, c, e 
D)  a, b, e 
E)  b, d, e

Question 11

Select all that occur during the plateau phase of an action potential on a cardiac muscle cell.
A) Calcium is entering the cell.
B) Potassium is exiting the cell.
C) Sodium is entering the cell.
D) Calcium is exiting the cell.

Accepted Answer

The answer of Select all that occur during the plateau...

Question 12

Typically, there are ________ papillary muscles that project from the wall of the left ventricle and attach to the tendinous cords that support the left AV valve.

Accepted Answer

A)  three 
B)  two 
C)  a highly variable number of 
D)  six 
E)  no 
A)  three 
B)  two 
C)  a highly variable number of 
D)  six 
E)  no

Question 13

During ventricular contraction

Accepted Answer

A)  only the AV valves open. 
B)  only the AV valves close. 
C)  only the semilunar valves close. 
D)  the semilunar valves close and the AV valves open. 
E)  the semilunar valves open and the AV valves close. 
A)  only the AV valves open. 
B)  only the AV valves close. 
C)  only the semilunar valves close. 
D)  the semilunar valves close and the AV valves open. 
E)  the semilunar valves open and the AV valves close.

Question 14

What would you expect a cardiologist to recommend if there was substantial occlusion to a patient's left coronary artery but not the right coronary artery?

Accepted Answer

A)  Because there are multiple alternate paths for blood delivery, the cardiologist would not intervene. 
B)  Because this is a relatively small, unimportant artery, the cardiologist would not intervene. 
C)  Because this is an important artery, and alternate vascular paths are inadequate, the cardiologist would treat the condition. 
D)  Because occlusions require blood to be moved under greater pressure, the cardiologist would prescribe drugs to raise blood pressure. 
A)  Because there are multiple alternate paths for blood delivery, the cardiologist would not intervene. 
B)  Because this is a relatively small, unimportant artery, the cardiologist would not intervene. 
C)  Because this is an important artery, and alternate vascular paths are inadequate, the cardiologist would treat the condition. 
D)  Because occlusions require blood to be moved under greater pressure, the cardiologist would prescribe drugs to raise blood pressure.

Question 15

Deep to the interventricular sulci is the thick muscular wall that divides the left and right ventricles, known as the interventricular ________.

Accepted Answer

The answer of Deep to the interventricular sulci is the...

Question 16

The numerous ________ within the intercalated discs prevent cardiac muscle fibers from pulling apart.

Accepted Answer

The answer of The numerous ________ within the intercalated discs...

Question 17

The left and right coronary arteries

Accepted Answer

A)  are interconnected with several high-volume anastomoses allowing for well-perfused alternate blood paths. 
B)  are functional end arteries because the blockage of one of them leads to tissue death in the area it supplies. 
A)  are interconnected with several high-volume anastomoses allowing for well-perfused alternate blood paths. 
B)  are functional end arteries because the blockage of one of them leads to tissue death in the area it supplies.

Question 18

According to the Frank-Starling law

Accepted Answer

A)  the more calcium available to the heart cell, the more forcefully it will contract. 
B)  as the volume of blood entering the heart increases, ventricular contractions become more forceful. 
C)  the faster the heart rate, the larger the stroke volume. 
D)  the greater the resistance from the arteries, the higher the blood pressure. 
A)  the more calcium available to the heart cell, the more forcefully it will contract. 
B)  as the volume of blood entering the heart increases, ventricular contractions become more forceful. 
C)  the faster the heart rate, the larger the stroke volume. 
D)  the greater the resistance from the arteries, the higher the blood pressure.

Question 19

A chemical that alters heart rate is known as a(n) ________ agent.

Accepted Answer

The answer of A chemical that alters heart rate is...

Question 20

Sympathetic innervation of the heart arises from the ________ segments of the spinal cord.

Accepted Answer

A)  T1-T5 
B)  T3-T8 
C)  T5-T10 
D)  T6-T11 
E)  T11-L2 
A)  T1-T5 
B)  T3-T8 
C)  T5-T10 
D)  T6-T11 
E)  T11-L2

Exam 19: Cardiovascular System: Heart

To initiate a cardiac muscle cell contraction, calcium

How many half-moon shaped, pocketlike cusps are found in each semilunar valve?

Which vein drains the posterior aspect of the ventricles of the heart?

Parasympathetic and sympathetic influence on heart rate is controlled by reflexes.

Each of the receiving chambers of the heart has a wrinkled flaplike extension; the one that is more visible from an anterior view is the

What part of the cardiac conduction system is located in the posterior wall of the right atrium, adjacent to the entrance of the superior vena cava?

The posterior interventricular artery is a branch off of the

Which correctly describes the heart's apex?

Blood flow to the heart wall courses through coronary vessels in a steady stream.

Select all that occur during the plateau phase of an action potential on a cardiac muscle cell. A) Calcium is entering the cell. B) Potassium is exiting the cell. C) Sodium is entering the cell. D) Calcium is exiting the cell.

Typically, there are ________ papillary muscles that project from the wall of the left ventricle and attach to the tendinous cords that support the left AV valve.

During ventricular contraction

What would you expect a cardiologist to recommend if there was substantial occlusion to a patient's left coronary artery but not the right coronary artery?

Deep to the interventricular sulci is the thick muscular wall that divides the left and right ventricles, known as the interventricular ________.

The numerous ________ within the intercalated discs prevent cardiac muscle fibers from pulling apart.

The left and right coronary arteries

According to the Frank-Starling law

A chemical that alters heart rate is known as a(n) ________ agent.

Sympathetic innervation of the heart arises from the ________ segments of the spinal cord.

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