Question 1

Depolarization of a cardiac muscle cell occurs as the result of:

Accepted Answer

A)   a decrease in the permeability of the cell membrane to ions.
B)   the rapid movement of ions across the cell membrane.
C)   a blockade by calcium ions.
D)   stimuli instigated during the refractory period.E) B) and C)
F) A) and C)

Question 2

A 28-year-old female with seizure disorder has a vagal nerve stimulator implanted to help control seizure activity. Which of the following would also be expected to occur?

Accepted Answer

A)   Increased speed of cardiac cycle
B)   Increased cardiac contractility
C)   Decreased vasodilation
D)   Decreased cardiac conductionE) All of the above
F) B) and C)

Question 3

Within a normal physiologic range, an increase in left ventricular end-diastolic volume leads to:

Accepted Answer

A)   an increased force of contraction.
B)   a decrease in cardiac output.
C)   an increase in heart rate.
D)   heart failure.E) A) and B)
F) None of the above

Question 4

The _____ period follows depolarization of the myocardium and represents a period during which no new cardiac potential can be propagated.

Accepted Answer

A)   absolute refractory
B)   hyperpolarization
C)   resting
D)   thresholdE) None of the above
F) B) and C)

Question 5

_____ is the pressure generated at the end of diastole.

Accepted Answer

A)   Preload
B)   Afterload
C)   Systemic vascular resistance
D)   Total peripheral resistanceE) None of the above
F) C) and D)

Question 6

_____ is the process by which an action potential in the plasma membrane of a myocardial cell triggers the events that directly cause contraction of the myocardial cells.

Accepted Answer

A)   Electrocontraction
B)   Intercalated communication
C)   Excitation-contraction coupling
D)   Myosin communicationE) None of the above
F) A) and B)

Question 7

A new drug is released to aid in weight loss. It stimulates the sympathetic system to increase heart rate by:

Accepted Answer

A)   inhibiting the release of catecholamines.
B)   altering the threshold potential.
C)   decreasing the conduction time through the AV node.
D)   increasing the influx of calcium.E) None of the above
F) A) and B)

Exam 22: Structure and Function of the Cardiovascular and Lymphatic Systems

A new drug is released to aid in weight loss. It stimulates the sympathetic system to increase heart rate by:

Correct Answer
verified

_____ is the pressure generated at the end of diastole.

Correct Answer
verified

Within a normal physiologic range, an increase in left ventricular end-diastolic volume leads to:

Correct Answer
verified

A 28-year-old female with seizure disorder has a vagal nerve stimulator implanted to help control seizure activity. Which of the following would also be expected to occur?

Correct Answer
verified

The _____ period follows depolarization of the myocardium and represents a period during which no new cardiac potential can be propagated.

Correct Answer
verified

_____ is the process by which an action potential in the plasma membrane of a myocardial cell triggers the events that directly cause contraction of the myocardial cells.

Correct Answer
verified

Depolarization of a cardiac muscle cell occurs as the result of:

Correct Answer
verified

Exam 22: Structure and Function of the Cardiovascular and Lymphatic Systems

A new drug is released to aid in weight loss. It stimulates the sympathetic system to increase heart rate by:

Correct AnswerverifiedShow Answer

_____ is the pressure generated at the end of diastole.

Correct AnswerverifiedShow Answer

Within a normal physiologic range, an increase in left ventricular end-diastolic volume leads to:

Correct AnswerverifiedShow Answer

A 28-year-old female with seizure disorder has a vagal nerve stimulator implanted to help control seizure activity. Which of the following would also be expected to occur?

Correct AnswerverifiedShow Answer

The _____ period follows depolarization of the myocardium and represents a period during which no new cardiac potential can be propagated.

Correct AnswerverifiedShow Answer

_____ is the process by which an action potential in the plasma membrane of a myocardial cell triggers the events that directly cause contraction of the myocardial cells.

Correct AnswerverifiedShow Answer

Depolarization of a cardiac muscle cell occurs as the result of:

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified