Question 1

During the plateau phase of a cardiac muscle cell's action potential,the membrane stays

Accepted Answer

A)  depolarized as potassium exits and calcium enters.
B)  depolarized as potassium enters and calcium exits.
C)  repolarized as sodium enters and calcium exits.
D)  hyperpolarized as sodium and calcium exit.
E)  hyperpolarized as potassium enters and calcium exits.F) A) and E)
G) A) and D)

Question 2

The hearts nodal cells have a more negative resting potential than neurons do,because nodal cells lack leak channels for sodium and potassium ions.

Accepted Answer

A) True 
 B)False

Question 3

The resistance in arteries to the ejection of blood by the heart is known as _________.

Accepted Answer

The answer of The resistance in arteries to the ejection...

Question 4

The base of the heart faces in the _____________ directions.

Accepted Answer

A)  anterior and inferior
B)  anterior and superior
C)  posterior and superior
D)  posterior and inferior
E)  None of these choices is correct.F) All of the above
G) None of the above

Question 5

The pericardial cavity is between the

Accepted Answer

A)  heart muscle and serous pericardium.
B)  fibrous and serous layers of the pericardium.
C)  visceral and parietal layers of the serous pericardium.
D)  parietal and myocardial layers of the fibrous pericardium.E) A) and B)
F) All of the above

Question 6

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 7

During ventricular contraction,the semilunar valves close in order to permit the blood to enter the large arterial trunks that carry blood away from the heart.

Accepted Answer

A) True 
 B)False

Question 8

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.E) A) and B)
F) B) and C)

Question 9

The term "epicardium" is another name for the

Accepted Answer

A)  visceral layer of the serosal pericardium.
B)  parietal layer of the serosal pericardium.
C)  external layer of the fibrous pericardium.
D)  myocardium.
E)  mediastinum.F) D) and E)
G) C) and E)

Question 10

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

Question 11

The connections shared by arteries that allow them to shunt blood from one artery to another are called _________________.

Accepted Answer

The answer of The connections shared by arteries that allow...

Question 12

Which of the following would cause a decrease in cardiac output

Accepted Answer

A)  An increase in venous return
B)  An increase in afterload
C)  Addition of positive inotropic agents
D)  An increase in heart rateE) A) and D)
F) A) and C)

Question 13

The function of the coronary sinus is to

Accepted Answer

A)  connect the top and bottom halves of the heart.
B)  guide the aorta out of the heart.
C)  guide the inferior vena cava into the right atrium.
D)  take blood from the coronary circulation to the right atrium.
E)  shunt blood from the right atrium to the left atrium.F) None of the above
G) A) and B)

Question 14

What are the cell-to-cell contacts of the cardiac muscle fibers called

Accepted Answer

A)  Z discs
B)  T-tubules
C)  Intercalated discs
D)  Cardiac discs
E)  Sarcoplasmic reticulumF) A) and B)
G) A) and E)

Question 15

The main functions of the cardiovascular system include the transport and exchange of respiratory gases,nutrients,and wastes throughout the body.

Accepted Answer

A) True 
 B)False

Question 16

Which carries oxygenated blood from the lungs to the heart

Accepted Answer

A)  Pulmonary arteries
B)  Pulmonary veins
C)  Pulmonary trunk
D)  Inferior vena cava
E)  Superior vena cavaF) A) and E)
G) C) and E)

Question 17

The middle layer of the heart wall that is made of cardiac muscle tissue is the ________________.

Accepted Answer

The answer of The middle layer of the heart wall...

Question 18

Cardiac reserve is greater in a nonathletic individual than in a highly trained athlete.

Accepted Answer

A) True 
 B)False

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

The foramen ovale of the fetal heart is an opening in the

Accepted Answer

A)  interventricular septum.
B)  interatrial septum.
C)  fossa ovalis.
D)  aorticopulmonary septum.
E)  tetralogy of Fallot.F) D) and E)
G) C) and E)

Exam 19: Cardiovascular System: Heart

The middle layer of the heart wall that is made of cardiac muscle tissue is the ________________.

Correct AnswerverifiedShow Answer

Which carries oxygenated blood from the lungs to the heart

Correct AnswerverifiedShow Answer

The term "epicardium" is another name for the

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The main functions of the cardiovascular system include the transport and exchange of respiratory gases,nutrients,and wastes throughout the body.

Correct AnswerverifiedShow Answer

What are the cell-to-cell contacts of the cardiac muscle fibers called

Correct AnswerverifiedShow Answer

According to the Frank-Starling law

Correct AnswerverifiedShow Answer

During the plateau phase of a cardiac muscle cell's action potential,the membrane stays

Correct AnswerverifiedShow Answer

The foramen ovale of the fetal heart is an opening in the

Correct AnswerverifiedShow Answer

Which of the following would cause a decrease in cardiac output

Correct AnswerverifiedShow Answer

During ventricular contraction,the semilunar valves close in order to permit the blood to enter the large arterial trunks that carry blood away from the heart.

Correct AnswerverifiedShow Answer

The base of the heart faces in the _____________ directions.

Correct AnswerverifiedShow Answer

Cardiac reserve is greater in a nonathletic individual than in a highly trained athlete.

Correct AnswerverifiedShow Answer

The hearts nodal cells have a more negative resting potential than neurons do,because nodal cells lack leak channels for sodium and potassium ions.

Correct AnswerverifiedShow Answer

The function of the coronary sinus is to

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

The pericardial cavity is between the

Correct AnswerverifiedShow Answer

The connections shared by arteries that allow them to shunt blood from one artery to another are called _________________.

Correct AnswerverifiedShow Answer

To initiate a cardiac muscle cell contraction,calcium

Correct AnswerverifiedShow Answer

The resistance in arteries to the ejection of blood by the heart is known as _________.

Correct AnswerverifiedShow Answer

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