Question 1

Figure 20-2 Cardiac Cycle
Use Figure 20-2 to answer the following question:
-What occurs at the area labeled "B" on the graph?

Accepted Answer

A)  ventricular ejection occurs
B)  AV valve closes
C)  semilunar valve opens
D)  semilunar valve closes
E)  AV valve opensF) C) and D)
G) B) and E)

Question 2

Oxygen is added to blood as it flows through the ________ circuit.

Accepted Answer

The answer of Oxygen is added to blood as it...

Question 3

Most of the middle layer in the heart wall is composed of

Accepted Answer

A)  cardiac muscle cells.
B)  chondrocytes.
C)  epitheliocytes.
D)  fibrocytes.
E)  smooth muscle cells.F) A) and B)
G) A) and C)

Question 4

Pacemaker cells isolated from the SA node generate action potentials at ________ beats per minute.

Accepted Answer

A)  20-40
B)  40-60
C)  80-100
D)  100-140
E)  140-180F) B) and E)
G) D) and E)

Question 5

Figure 20-1 The Heart
Use Figure 20-1 to answer the following question:
-Identify the structure labeled "8."

Accepted Answer

A)  moderator band
B)  pectinate muscles
C)  papillary muscles
D)  trabeculae carneae
E)  chordae tendineaeF) B) and D)
G) C) and E)

Question 6

Tetanic muscle contractions don't occur in a normal cardiac muscle because

Accepted Answer

A)  cardiac muscle tissue contracts on its own.
B)  neural stimulation is lacking.
C)  the refractory period lasts until the muscle relaxes.
D)  the refractory period ends before the muscle reaches peak tension.
E)  potassium channels outnumber sodium channels.F) D) and E)
G) B) and C)

Question 7

Blood returning to the heart from the systemic circuit first enters the

Accepted Answer

A)  right atrium.
B)  right ventricle.
C)  left atrium.
D)  left ventricle.
E)  conus arteriosus.F) A) and C)
G) C) and D)

Question 8

Oxygen is removed from blood as it flows through the ________ circuit.

Accepted Answer

The answer of Oxygen is removed from blood as it...

Question 9

Drugs known as calcium channel blockers such as nifedipine can be used to

Accepted Answer

A)  decrease the force of cardiac contraction.
B)  decrease blood pressure.
C)  dilate the coronary arteries.
D)  produce a negative inotropic effect.
E)  All of the answers are correct.F) B) and E)
G) A) and E)

Question 10

Cardiac output is increased by

Accepted Answer

A)  sympathetic stimulation.
B)  increased end systolic volume.
C)  decreased end diastolic volume.
D)  decreased venous return.
E)  inhibiting the atrial reflex.F) All of the above
G) A) and E)

Question 11

The amount of blood returning to the heart is the ________.

Accepted Answer

The answer of The amount of blood returning to the...

Question 12

The foramen ovale in the fetal heart is located in the

Accepted Answer

A)  right atrium.
B)  left atrium.
C)  right ventricle.
D)  left ventricle.
E)  interatrial septum.F) D) and E)
G) All of the above

Question 13

The relaxation phase of the cardiac cycle is called ________.

Accepted Answer

The answer of The relaxation phase of the cardiac cycle...

Question 14

Figure 20-1 The Heart
Use Figure 20-1 to answer the following question:
-Identify the structure labeled "19."

Accepted Answer

A)  tricuspid valve
B)  pulmonary semilunar valve
C)  aortic semilunar valve
D)  bicuspid valve
E)  ligamentum arteriosumF) C) and E)
G) A) and B)

Question 15

The systolic part (both atrial and ventricular) of a cardiac cycle lasts on average

Accepted Answer

A)  3 seconds.
B)  370 msec.
C)  5 seconds.
D)  100 msec.
E)  800 msec.F) A) and E)
G) B) and C)

Question 16

The earlike extension of the atrium is the

Accepted Answer

A)  ventricle.
B)  coronary sinus.
C)  coronary sulcus.
D)  auricle.
E)  atricle.F) C) and D)
G) All of the above

Question 17

Blood is supplied to the myocardium by

Accepted Answer

A)  the coronary sinus.
B)  contact with blood in the pumping chambers.
C)  the coronary arteries.
D)  arteries that branch from the pulmonary arteries.
E)  arteries that branch off the subclavian arteries.F) B) and E)
G) None of the above

Question 18

Muscular ridges on the inner surface of the ventricles are called ________.

Accepted Answer

The answer of Muscular ridges on the inner surface of...

Question 19

A fine tubular wire mesh called a ________ may be inserted into a coronary vessel,holding it open.

Accepted Answer

The answer of A fine tubular wire mesh called a...

Question 20

Cardiac muscle cells and skeletal muscle cells differ in a few ways.Which of the following is not one of them?

Accepted Answer

A)  Cardiac muscle cells are smaller in size.
B)  Cardiac muscle cells have a single,centered nucleus.
C)  Cardiac muscle cells branch.
D)  Skeletal muscle cells lack intercalated discs.
E)  Cardiac muscle cells lack transverse tubules.F) A) and E)
G) None of the above

Exam 20: The Heart

Cardiac muscle cells and skeletal muscle cells differ in a few ways.Which of the following is not one of them?

Correct AnswerverifiedShow Answer

The foramen ovale in the fetal heart is located in the

Correct AnswerverifiedShow Answer

The earlike extension of the atrium is the

Correct AnswerverifiedShow Answer

Blood returning to the heart from the systemic circuit first enters the

Correct AnswerverifiedShow Answer

Oxygen is removed from blood as it flows through the ________ circuit.

Correct AnswerverifiedShow Answer

The systolic part (both atrial and ventricular) of a cardiac cycle lasts on average

Correct AnswerverifiedShow Answer

Most of the middle layer in the heart wall is composed of

Correct AnswerverifiedShow Answer

Muscular ridges on the inner surface of the ventricles are called ________.

Correct AnswerverifiedShow Answer

Drugs known as calcium channel blockers such as nifedipine can be used to

Correct AnswerverifiedShow Answer

Figure 20-1 The Heart Use Figure 20-1 to answer the following question: -Identify the structure labeled "19."

Correct AnswerverifiedShow Answer

Figure 20-2 Cardiac Cycle Use Figure 20-2 to answer the following question: -What occurs at the area labeled "B" on the graph?

Correct AnswerverifiedShow Answer

Blood is supplied to the myocardium by

Correct AnswerverifiedShow Answer

Pacemaker cells isolated from the SA node generate action potentials at ________ beats per minute.

Correct AnswerverifiedShow Answer

Figure 20-1 The Heart Use Figure 20-1 to answer the following question: -Identify the structure labeled "8."

Correct AnswerverifiedShow Answer

The amount of blood returning to the heart is the ________.

Correct AnswerverifiedShow Answer

A fine tubular wire mesh called a ________ may be inserted into a coronary vessel,holding it open.

Correct AnswerverifiedShow Answer

Cardiac output is increased by

Correct AnswerverifiedShow Answer

Tetanic muscle contractions don't occur in a normal cardiac muscle because

Correct AnswerverifiedShow Answer

The relaxation phase of the cardiac cycle is called ________.

Correct AnswerverifiedShow Answer

Oxygen is added to blood as it flows through the ________ circuit.

Correct AnswerverifiedShow Answer

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