Question 1

What ion movement changes the membrane potential in a contractile cell from negative to positive?

Accepted Answer

A)  influx of sodium ions 
B)  outflow of potassium ions 
C)  influx of calcium ions 
D)  outflow of calcium ions 
A)  influx of sodium ions 
B)  outflow of potassium ions 
C)  influx of calcium ions 
D)  outflow of calcium ions

Question 2

Explain why the QRS wave on an electrocardiogram (ECG) is normally larger than a P wave.

Accepted Answer

The QRS wave on an electrocardiogram is

Question 3

Inotropic agents affect:

Accepted Answer

A)  heart rate. 
B)  stroke volume. 
C)  depolarization. 
D)  contractility. 
A)  heart rate. 
B)  stroke volume. 
C)  depolarization. 
D)  contractility.

Question 4

Define the terms diastole and systole.

Accepted Answer

Each cardiac cycle consists of

Question 5

Where should the left ventricle send blood?

Accepted Answer

A)  coronary sinus 
B)  aorta 
C)  left atrium 
D)  pulmonary trunk 
A)  coronary sinus 
B)  aorta 
C)  left atrium 
D)  pulmonary trunk

Question 6

When is the S1 heart sound heard?

Accepted Answer

A)  isovolumetric contraction phase 
B)  ventricular filling 
C)  ventricular ejection phase 
D)  isovolumetric relaxation phase 
A)  isovolumetric contraction phase 
B)  ventricular filling 
C)  ventricular ejection phase 
D)  isovolumetric relaxation phase

Question 7

Predict the effect on the ventricles if the AV node delay was shorter than normal.

Accepted Answer

Ventricles would not have the opportunit

Question 8

Calculate the end -systolic volume (ESV) if the end -diastolic volume (EDV) in a resting heart is 110 ml and stroke volume (SV) is 70 ml.

Accepted Answer

A)  180 ml 
B)  40 ml 
C)  10 ml 
D)  50 ml 
A)  180 ml 
B)  40 ml 
C)  10 ml 
D)  50 ml

Question 9

Which vessel is guarded by a semilunar valve at its base?

Accepted Answer

A)  pulmonary trunk 
B)  superior vena cava 
C)  pulmonary vein 
D)  coronary sinus 
A)  pulmonary trunk 
B)  superior vena cava 
C)  pulmonary vein 
D)  coronary sinus

Question 10

The sinoatrial (SA) node fires more rapidly at higher body temperatures, increasing cardiac output.

Accepted Answer

A) True 
 B)False

Question 11

On an electrocardiogram (ECG), atrial repolarization is obscured by the:

Accepted Answer

A)  S -T segment. 
B)  P wave. 
C)  T wave. 
D)  QRS wave. 
A)  S -T segment. 
B)  P wave. 
C)  T wave. 
D)  QRS wave.

Question 12

Determine the impact if the connection between the sinoatrial (SA) node and the atrioventricular (AV) node becomes blocked.

Accepted Answer

A)  The ventricular rhythm will not change. 
B)  The ventricles will beat faster. 
C)  The ventricles will beat more slowly. 
D)  The atria will contract more forcefully. 
A)  The ventricular rhythm will not change. 
B)  The ventricles will beat faster. 
C)  The ventricles will beat more slowly. 
D)  The atria will contract more forcefully.

Question 13

The pulmonary circuit involves blood flow from the heart to and from the:

Accepted Answer

A)  body. 
B)  brain. 
C)  liver. 
D)  lungs. 
A)  body. 
B)  brain. 
C)  liver. 
D)  lungs.

Question 14

From superficial to deep, the pericardial sac consists of the fibrous pericardium, visceral pericardium, parietal pericardium, and the epicardium.

Accepted Answer

A) True 
 B)False

Question 15

What activity is occurring in the heart during the Q -T interval on an electrocardiogram (ECG)?

Accepted Answer

A)  The AV node delay occurs as the action potential spreads from the SA node to the atria to the ventricles. 
B)  The ventricular cells are undergoing action potentials. 
C)  The ventricular cells are repolarizing. 
D)  The atrial cells are undergoing action potentials. 
A)  The AV node delay occurs as the action potential spreads from the SA node to the atria to the ventricles. 
B)  The ventricular cells are undergoing action potentials. 
C)  The ventricular cells are repolarizing. 
D)  The atrial cells are undergoing action potentials.

Question 16

Explain how to calculate cardiac output (CO).

Accepted Answer

To determine cardiac output for a ventri

Question 17

Generally, coronary veins empty into a vessel known as the:

Accepted Answer

A)  inferior vena cava. 
B)  coronary sinus. 
C)  aorta. 
D)  superior vena cava. 
A)  inferior vena cava. 
B)  coronary sinus. 
C)  aorta. 
D)  superior vena cava.

Question 18

Describe the structures and functions of the two layers that compose the pericardium surrounding the heart.

Accepted Answer

The pericardium is a sac with two compon

Question 19

What do pacemaker cell action potentials lack?

Accepted Answer

A)  repolarization 
B)  depolarization 
C)  threshold 
D)  plateau phase 
A)  repolarization 
B)  depolarization 
C)  threshold 
D)  plateau phase

Question 20

The right side of the heart receives:

Accepted Answer

A)  oxygenated blood from the systemic circuit. 
B)  oxygenated blood from the pulmonary circuit. 
C)  deoxygenated blood from the pulmonary circuit. 
D)  deoxygenated blood from the systemic circuit. 
A)  oxygenated blood from the systemic circuit. 
B)  oxygenated blood from the pulmonary circuit. 
C)  deoxygenated blood from the pulmonary circuit. 
D)  deoxygenated blood from the systemic circuit.

Exam 17: The Cardiovascular System I: the Heart

What ion movement changes the membrane potential in a contractile cell from negative to positive?

Explain why the QRS wave on an electrocardiogram (ECG) is normally larger than a P wave.

Inotropic agents affect:

Define the terms diastole and systole.

Where should the left ventricle send blood?

When is the S1 heart sound heard?

Predict the effect on the ventricles if the AV node delay was shorter than normal.

Calculate the end -systolic volume (ESV) if the end -diastolic volume (EDV) in a resting heart is 110 ml and stroke volume (SV) is 70 ml.

Which vessel is guarded by a semilunar valve at its base?

The sinoatrial (SA) node fires more rapidly at higher body temperatures, increasing cardiac output.

On an electrocardiogram (ECG), atrial repolarization is obscured by the:

Determine the impact if the connection between the sinoatrial (SA) node and the atrioventricular (AV) node becomes blocked.

The pulmonary circuit involves blood flow from the heart to and from the:

From superficial to deep, the pericardial sac consists of the fibrous pericardium, visceral pericardium, parietal pericardium, and the epicardium.

What activity is occurring in the heart during the Q -T interval on an electrocardiogram (ECG)?

Explain how to calculate cardiac output (CO).

Generally, coronary veins empty into a vessel known as the:

Describe the structures and functions of the two layers that compose the pericardium surrounding the heart.

What do pacemaker cell action potentials lack?

The right side of the heart receives:

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Calculate the end ^-systolic volume (ESV) if the end ^-diastolic volume (EDV) in a resting heart is 110 ml and stroke volume (SV) is 70 ml.

What activity is occurring in the heart during the Q ^-T interval on an electrocardiogram (ECG)?