Question 1

Norepinephrine is considered a positive chronotropic agent because it causes

Accepted Answer

A)  less calcium to enter heart cells,which leads to lower risk of heart attack.
B)  more forceful contractions during each heart rate.
C)  an increase in the firing rate of SA node cells.
D)  thyroid hormone to have a steadying effect on heart activity.
E)  heart cell membrane potentials to become more positive during action potentials.F) A) and D)
G) B) and C)

Question 2

The pulmonary trunk receives blood from the right ventricle and conducts it toward the lung.The pulmonary trunk is a(n)

Accepted Answer

A)  artery.
B)  capillary.
C)  vein.D) None of the above
E) B) and C)

Question 3

Contrast the length-tension relationship for cardiac muscle to that which is found in skeletal muscle.In other words,for each type of muscle,what is the optimal length
 How is such an arrangement adaptive to cardiac muscle

Accepted Answer

Unlike skeletal muscle,cardiac muscle do...

Question 4

Cardiac reserve is

Accepted Answer

A)  the potential increase in stroke volume someone would show if they engaged in athletic training.
B)  the increase in cardiac output an individual is capable of demonstrating during vigorous exercise.
C)  the amount of blood left in the heart after the ventricle has contracted during cardiac cycles at rest.
D)  the blood that the heart uses to nourish its cardiac muscle and does not put into general circulation.E) A) and B)
F) None of the above

Question 5

Which describes the endocardium
A: Has single layer of epithelium
B: Has layer of areolar connective tissue
C: Epithelial cells are squamous
D: Epithelial cells are cuboidal
E: Has layer of adipose connective tissue
F: Has patches of myocardium

Accepted Answer

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

Question 6

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.F) D) and E)
G) A) and E)

Question 7

The heartbeat is initiated by the cells of the _______________ node.or

Accepted Answer

The answer of The heartbeat is initiated by the cells...

Question 8

Pectinate muscles are found on the

Accepted Answer

A)  posterior wall of the right ventricle.
B)  anterior wall of the right ventricle.
C)  internal walls of the right and left atria.
D)  posterior walls of the right and left ventricles.
E)  external wall of the right atrium.F) A) and B)
G) A) and C)

Question 9

At the AV node of the conduction system,the action potential is

Accepted Answer

A)  rapidly advanced due to the cells being large and well connected by gap junctions.
B)  rapidly advanced due to the cells being small and well insulated by myelin.
C)  delayed due to the cells being small and having few gap junctions.
D)  delayed due to the cells being large and having many leakage channels.E) None of the above
F) All of the above

Question 10

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 11

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

Accepted Answer

A) True 
 B)False

Question 12

Which are functions performed by the fibrous skeleton of the heart
A: Separates the atria and ventricles
B: Anchors the heart valves
C: Provides electrical insulation between the atria and ventricles
D: Provides the framework for the attachment of the myocardium
E: None of these are true functions of the fibrous skeleton of the heart

Accepted Answer

A)  a,d
B)  b,d
C)  a,c,d
D)  a,b,c,d
E)  eF) B) and D)
G) A) and E)

Question 13

Once an SA nodal cell reaches threshold,the depolarization phase occurs during which

Accepted Answer

A)  potassium comes in through fast voltage-gated channels.
B)  calcium comes in through fast voltage-gated channels.
C)  potassium moves out through fast voltage-gated channels.
D)  sodium moves out through slow voltage-gated channels.
E)  calcium moves out through slow voltage-gated channels.F) A) and B)
G) C) and D)

Question 14

Cardiac output is usually expressed in

Accepted Answer

A)  beats per minute.
B)  mL per beat.
C)  mm Hg.
D)  liters per minute.E) B) and C)
F) A) and D)

Question 15

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.F) A) and B)
G) A) and E)

Question 16

The posterior interventricular sulcus

Accepted Answer

A)  is another name for the coronary sulcus.
B)  contains the great cardiac vein and coronary sinus.
C)  is a groove between the ventricles on the back of the heart.
D)  is a valve in the interventricular septum that closes at birth.E) None of the above
F) B) and C)

Question 17

As with action potentials in other types of cells,the repolarization of cardiac muscle cells involves the

Accepted Answer

A)  entrance of calcium through voltage-gated channels.
B)  exit of potassium through voltage-gated channels.
C)  entrance of sodium through voltage-gated channels.
D)  binding of ACh to ACh receptor.
E)  simultaneous closure of sodium channels and opening of calcium channels.F) C) and D)
G) None of the above

Question 18

Normally,the left and right ventricles eject the same amount of blood.

Accepted Answer

A) True 
 B)False

Question 19

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

Accepted Answer

A)  1
B)  2
C)  3
D)  4
E)  6F) A) and E)
G) C) and D)

Question 20

Which segment of the ECG reflects the plateau phase of ventricular muscle cells' action potentials

Accepted Answer

A)  P-T segment
B)  S-T segment
C)  Q-R segment
D)  P-R interval
E)  T-P intervalF) B) and E)
G) None of the above

Exam 19: Cardiovascular System: Heart

Normally,the left and right ventricles eject the same amount of blood.

Correct Answer
verified

Contrast the length-tension relationship for cardiac muscle to that which is found in skeletal muscle.In other words,for each type of muscle,what is the optimal length How is such an arrangement adaptive to cardiac muscle

Correct Answer
verified
Unlike skeletal muscle,cardiac muscle do...
View Answer

Which segment of the ECG reflects the plateau phase of ventricular muscle cells' action potentials

Correct Answer
verified

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

Correct Answer
verified

Which describes the endocardium A: Has single layer of epithelium B: Has layer of areolar connective tissue C: Epithelial cells are squamous D: Epithelial cells are cuboidal E: Has layer of adipose connective tissue F: Has patches of myocardium

Correct Answer
verified

The pulmonary trunk receives blood from the right ventricle and conducts it toward the lung.The pulmonary trunk is a(n)

Correct Answer
verified

Pectinate muscles are found on the

Correct Answer
verified

The posterior interventricular sulcus

Correct Answer
verified

The heartbeat is initiated by the cells of the _______________ node.or

Correct Answer
verified

As with action potentials in other types of cells,the repolarization of cardiac muscle cells involves the

Correct Answer
verified

Norepinephrine is considered a positive chronotropic agent because it causes

Correct Answer
verified

Correct Answer
verified

The posterior interventricular artery is a branch off of the

Correct Answer
verified

Once an SA nodal cell reaches threshold,the depolarization phase occurs during which

Correct Answer
verified

During ventricular contraction

Correct Answer
verified

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

Correct Answer
verified

At the AV node of the conduction system,the action potential is

Correct Answer
verified

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

Correct Answer
verified

Cardiac output is usually expressed in

Correct Answer
verified

Cardiac reserve is

Correct Answer
verified

Exam 19: Cardiovascular System: Heart

Normally,the left and right ventricles eject the same amount of blood.

Correct AnswerverifiedShow Answer

Contrast the length-tension relationship for cardiac muscle to that which is found in skeletal muscle.In other words,for each type of muscle,what is the optimal length How is such an arrangement adaptive to cardiac muscle

Correct AnswerverifiedUnlike skeletal muscle,cardiac muscle do...View AnswerShow Answer

Which segment of the ECG reflects the plateau phase of ventricular muscle cells' action potentials

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Which describes the endocardium A: Has single layer of epithelium B: Has layer of areolar connective tissue C: Epithelial cells are squamous D: Epithelial cells are cuboidal E: Has layer of adipose connective tissue F: Has patches of myocardium

Correct AnswerverifiedShow Answer

The pulmonary trunk receives blood from the right ventricle and conducts it toward the lung.The pulmonary trunk is a(n)

Correct AnswerverifiedShow Answer

Pectinate muscles are found on the

Correct AnswerverifiedShow Answer

The posterior interventricular sulcus

Correct AnswerverifiedShow Answer

The heartbeat is initiated by the cells of the _______________ node.or

Correct AnswerverifiedShow Answer

As with action potentials in other types of cells,the repolarization of cardiac muscle cells involves the

Correct AnswerverifiedShow Answer

Norepinephrine is considered a positive chronotropic agent because it causes

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The posterior interventricular artery is a branch off of the

Correct AnswerverifiedShow Answer

Once an SA nodal cell reaches threshold,the depolarization phase occurs during which

Correct AnswerverifiedShow Answer

During ventricular contraction

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

At the AV node of the conduction system,the action potential is

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Cardiac output is usually expressed in

Correct AnswerverifiedShow Answer

Cardiac reserve is

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified
Unlike skeletal muscle,cardiac muscle do...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified