Question 1

From which view is the connection between the pulmonary veins and the heart most visible

Accepted Answer

A)  Anterior view
B)  Posterior viewC) A) and B)
D) undefined

Question 2

The left ventricle walls are typically thicker than the right ventricular wall.

Accepted Answer

A) True 
 B)False

Question 3

The beginning of contraction in the ventricles is called _________ _________.

Accepted Answer

isovolumet...

Question 4

The membrane of a contractile cardiac muscle cell contains

Accepted Answer

A)  fast voltage-gated sodium channels and fast voltage-gated calcium channels.
B)  fast voltage-gated sodium channels and slow voltage-gated calcium channels.
C)  slow voltage-gated sodium channels and slow voltage-gated calcium channels.
D)  slow voltage-gated sodium channels and fast voltage-gated calcium channels.E) A) and C)
F) All of the above

Question 5

The pericardium helps prevent overfilling of the heart and it lessens the friction of movements during heartbeats.

Accepted Answer

A) True 
 B)False

Question 6

The time that starts when a muscle cell is depolarized and ends when it is able to be restimulated is the __________ period.

Accepted Answer

The answer of The time that starts when a muscle...

Question 7

This artery is sometimes referred to as the "widowmaker" because blockage of it often leads to fatal heart attack.It serves the front of the heart and is more formally called the (2 words)_________ __________ artery.or

Accepted Answer

anterior i...

Question 8

Sympathetic innervation of the heart
A: increases the heart rate
B: decreases the heart rate
C: increases the force of contractions
D: decreases the force of contractions
E: has no effect on contraction force

Accepted Answer

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

Question 9

The atrial reflex relies upon chemoreceptors to detect stretch in the atrial wall.The atrial reflex relies upon baroreceptors to detect stretch in the atrial wall.

Accepted Answer

A) True 
 B)False

Question 10

Large doses of certain stimulants can lead to dangerous increases in heart rates.Such a stimulant is a

Accepted Answer

A)  positive chronotropic agent.
B)  negative chronotropic agent.
C)  positive inotropic agent.
D)  negative inotropic agent.E) A) and D)
F) C) and D)

Question 11

During the S-T segment,what is occurring within cardiac muscle cells

Accepted Answer

A)  Sodium is rapidly diffusing out of atrial muscle cells.
B)  Sodium channels are beginning to open in ventricular cells and calcium is entering through slow channels in atrial cells.
C)  Calcium is entering and potassium is leaving ventricular cells.
D)  Potassium is entering atrial cells and sodium is leaving ventricular cells.E) B) and D)
F) A) and C)

Question 12

The opening and closing of the heart valves is caused by

Accepted Answer

A)  contraction and relaxation of papillary muscles that pull on heart strings.
B)  pressure changes of alternating contraction and relaxation during the cardiac cycle.
C)  contraction of the smooth muscle in the walls of the great vessels leaving the heart.
D)  action potentials within the cusps of the valves.E) C) and D)
F) B) and D)

Question 13

Which of the following is not one of the three main factors influencing stroke volume

Accepted Answer

A)  Afterload
B)  Chronotropic agents
C)  Inotropic agents
D)  Venous returnE) A) and B)
F) None of the above

Question 14

All of the heart's sulci house blood vessels that supply the myocardium.

Accepted Answer

A) True 
 B)False

Question 15

Cardiac muscle is able to use a variety of fuel types for cellular respiration.

Accepted Answer

A) True 
 B)False

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 shutting of the semilunar valves occurs during which phase

Accepted Answer

A)  Isovolumetric contraction
B)  Ventricular ejection
C)  Isovolumetric relaxation
D)  Atrial contraction and ventricular filling
E)  Late ventricular diastoleF) A) and D)
G) A) and C)

Question 18

The membrane of a contractile cardiac muscle cell contains

Accepted Answer

A)  no calcium pumps.
B)  calcium pumps that move calcium out of the cell.
C)  calcium pumps that move calcium into the cell.
D)  calcium pumps that open and allow calcium to diffuse down its concentration gradient to reach equilibrium.E) None of the above
F) A) and D)

Question 19

The plateau phase of an action potential

Accepted Answer

A)  occurs only in skeletal muscle and makes those fibers' contractions most forceful.
B)  leads to tetanic contractions in smooth and skeletal muscle.
C)  allows cardiac muscle cells to contract and then relax without locking up.
D)  allows cardiac muscle cells to exhibit synchronous fibrillation.E) B) and D)
F) All of the above

Question 20

Parasympathetic innervation of the heart occurs via

Accepted Answer

A)  CN IV.
B)  CN VI.
C)  CN VIII.
D)  CN X.
E)  CN XII.F) B) and E)
G) All of the above

Exam 19: Cardiovascular System: Heart

The membrane of a contractile cardiac muscle cell contains

Correct AnswerverifiedShow Answer

From which view is the connection between the pulmonary veins and the heart most visible

Correct AnswerverifiedShow Answer

Sympathetic innervation of the heart A: increases the heart rate B: decreases the heart rate C: increases the force of contractions D: decreases the force of contractions E: has no effect on contraction force

Correct AnswerverifiedShow Answer

The time that starts when a muscle cell is depolarized and ends when it is able to be restimulated is the __________ period.

Correct AnswerverifiedShow Answer

The pericardium helps prevent overfilling of the heart and it lessens the friction of movements during heartbeats.

Correct AnswerverifiedShow Answer

During the S-T segment,what is occurring within cardiac muscle cells

Correct AnswerverifiedShow Answer

This artery is sometimes referred to as the "widowmaker" because blockage of it often leads to fatal heart attack.It serves the front of the heart and is more formally called the (2 words)_________ __________ artery.or

Correct Answerverifiedanterior i...View AnswerShow Answer

The opening and closing of the heart valves is caused by

Correct AnswerverifiedShow Answer

Cardiac muscle is able to use a variety of fuel types for cellular respiration.

Correct AnswerverifiedShow Answer

The beginning of contraction in the ventricles is called _________ _________.

Correct Answerverifiedisovolumet...View AnswerShow Answer

Large doses of certain stimulants can lead to dangerous increases in heart rates.Such a stimulant is a

Correct AnswerverifiedShow Answer

The plateau phase of an action potential

Correct AnswerverifiedShow Answer

Parasympathetic innervation of the heart occurs via

Correct AnswerverifiedShow Answer

The atrial reflex relies upon chemoreceptors to detect stretch in the atrial wall.The atrial reflex relies upon baroreceptors to detect stretch in the atrial wall.

Correct AnswerverifiedShow Answer

The shutting of the semilunar valves occurs during which phase

Correct AnswerverifiedShow Answer

All of the heart's sulci house blood vessels that supply the myocardium.

Correct AnswerverifiedShow Answer

The membrane of a contractile cardiac muscle cell contains

Correct AnswerverifiedShow Answer

The left ventricle walls are typically thicker than the right ventricular wall.

Correct AnswerverifiedShow Answer

Which of the following is not one of the three main factors influencing stroke volume

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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This artery is sometimes referred to as the "widowmaker" because blockage of it often leads to fatal heart attack.It serves the front of the heart and is more formally called the (2 words)_ __ artery.or

Correct Answer
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anterior i...
View Answer

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The beginning of contraction in the ventricles is called _ _.

Correct Answer
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isovolumet...
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