Filters
Question type
Study Flashcards

If the AV node is damaged so that it can no longer transmit the signal from the SA node (total heart block) , will the ventricles continue to contract? Why or why not?


A) No: there are no cells left to pace and coordinate the heart beat.
B) Yes: the AV bundle will keep the heart going at the usual rate.
C) Yes: however, ventricular contractions will no longer follow atrial contractions, and the rate of ventricular contractions will be significantly slowed.
D) No: the SA node must be intact to pace the system.

E) B) and C)
F) A) and D)

Correct Answer

verifed

verified

The middle and largest deflection wave in a normal ECG is the .


A) T wave
B) QRS complex
C) P wave

D) All of the above
E) B) and C)

Correct Answer

verifed

verified

This portion of the ECG is associated with ventricular contraction.


A) Q-T interval
B) P-R interval
C) QRS complex
D) S-T segment

E) All of the above
F) A) and D)

Correct Answer

verifed

verified

The P wave of the ECG represents .


A) depolarization of the atria
B) depolarization of the ventricles
C) repolarization of the atria
D) repolarization of the ventricles

E) A) and C)
F) B) and D)

Correct Answer

verifed

verified

Ventricular fibrillation is .


A) fluttering of the atria
B) slow, strong ventricular contractions
C) strong, rhythmic atrial contractions
D) rapid, uncoordinated ventricular contractions

E) A) and D)
F) All of the above

Correct Answer

verifed

verified

In the normal heart, the has the highest rate of discharge and sets the rate of depolarization for the heart as a whole.


A) bundle branches
B) AV bundle
C) AV node
D) SA node

E) All of the above
F) A) and B)

Correct Answer

verifed

verified

D

The function of the intrinsic conduction system is to .


A) ensure that the heart beats in a sequential and coordinated manner
B) carry branches of the autonomic nervous system to heart muscle
C) maintain the structural integrity of the atria and ventricles
D) contract slightly before the cardiac tissue to which it is connected

E) None of the above
F) B) and C)

Correct Answer

verifed

verified

A

The electrocardiogram (ECG) shows a record of .


A) electrical activity of the heart muscle
B) each heart beat (or contraction)
C) the electrical events in the intrinsic conduction system

D) All of the above
E) A) and B)

Correct Answer

verifed

verified

The QRS complex is associated with .


A) repolarization of the ventricles
B) depolarization of the atria
C) depolarization of the ventricles
D) depolarization of the ventricular septum

E) None of the above
F) B) and C)

Correct Answer

verifed

verified

Bradycardia describes a heart rate of _.


A) over 100 beats/min
B) 60-80 beats/min
C) 80-100 beats/min
D) less than 60 beats/min

E) B) and D)
F) B) and C)

Correct Answer

verifed

verified

In sequential order, the components of the intrinsic conduction system, beginning at the SA node, are .


A) AV node, AV bundle, bundle branches, subendocardial conducting network (Purkinje fibers)
B) bundle branches, AV node, AV bundle, subendocardial conducting network (Purkinje fibers)
C) subendocardial conducting network (Purkinje fibers) , bundle branches, AV bundle, AV node
D) AV bundle, AV node, subendocardial conducting network (Purkinje fibers) , bundle branches

E) None of the above
F) A) and D)

Correct Answer

verifed

verified

A health care provider who suspects that a patient is having a heart attack will look very carefully at this portion of the ECG.


A) S-T segment
B) P-R interval
C) QRS complex
D) Q-T interval

E) B) and D)
F) All of the above

Correct Answer

verifed

verified

It the interval between R waves is on an ECG is 0.80 sec, then the heart rate is .


A) 70 beats/min
B) 80 beats/min
C) 65 beats/min
D) 75 beats/min

E) C) and D)
F) B) and C)

Correct Answer

verifed

verified

The T wave of the ECG represents _.


A) repolarization of the ventricles
B) depolarization of the ventricles
C) repolarization of the atria
D) depolarization of the atria

E) A) and D)
F) B) and C)

Correct Answer

verifed

verified

A normal Q-T interval is .


A) 0.08 sec when the heart rate is 50 beats/min
B) 0.16-0.18 sec when the heart rate is 60 beats/min
C) 0.32-0.38 sec when heart rate is 70 beats/min
D) 1.0-2.0 sec when heart rate is 80 beats/min

E) None of the above
F) B) and C)

Correct Answer

verifed

verified

During exercise, the heart rate .


A) decreases slightly, but the contractions are stronger
B) increases proportional to the exertion involved
C) increases to a set "exercise rate"
D) decreases in inverse relation to the exertion involved

E) All of the above
F) None of the above

Correct Answer

verifed

verified

Atrial fibrillation is .


A) slow, strong ventricular contractions
B) strong, rhythmic atrial contractions
C) rapid, uncoordinated ventricular contractions
D) uncoordinated beating of the atria

E) B) and D)
F) None of the above

Correct Answer

verifed

verified

How does holding the breath affect heart rate?


A) heart rate increases
B) heart rate decreases
C) heart rate is unaffected by breath holding

D) B) and C)
E) A) and C)

Correct Answer

verifed

verified

B

Showing 1 - 18 of 18

Related Exams

Exam 1

The Language of Anatomy

30 Questions

Exam 2

Organ Systems Overview

20 Questions

Exam 3

The Microscope

25 Questions

Exam 4

The Cell: Anatomy and Division

26 Questions

Exam 5

The Cell: Transport Mechanisms and Cell Permeability

26 Questions

Exam 6

Classification of Tissues

30 Questions

Exam 7

The Integumentary System

26 Questions

Exam 8

Overview of the Skeleton: Classification and Structure of Bones and Cartilages

29 Questions

Exam 9

The Axial Skeleton

32 Questions

Exam 10

The Appendicular Skeleton

27 Questions

Exam 11

Articulations and Body Movements

28 Questions

Exam 12

Microscopic Anatomy and Organization of Skeletal Muscle

23 Questions

Exam 13

Gross Anatomy of Muscular System

31 Questions

Exam 14

Skeletal Muscle Physiology: Frogs and Human Subjects

27 Questions

Exam 15

Histology of Nervous Tissue

31 Questions

Exam 16

Neurophysiology of Nerve Impulses: Frog Subjects

23 Questions

Exam 17

Gross Anatomy of the Brain and Cranial Nerves

32 Questions

Exam 18

Electroencephalography

14 Questions

Exam 19

The Spinal Cord and Spinal Nerves

25 Questions

Exam 20

The Autonomic Nervous System

21 Questions

Exam 21

Human Reflex Physiology

15 Questions

Exam 22

General Sensation

23 Questions

Exam 23

Special Senses: Anatomy of the Visual System

24 Questions

Exam 24

Special Senses: Visual Tests and Experiments

13 Questions

Exam 25

Special Senses: Hearing and Equilibrium

26 Questions

Exam 26

Special Senses: Olfaction and Taste

24 Questions

Exam 27

Functional Anatomy of the Endocrine Glands

28 Questions

Exam 28

Endocrine Wet Labs and Human Metabolism

16 Questions

Exam 29

Blood

24 Questions

Exam 30

Anatomy of the Heart

28 Questions

Exam 32

Anatomy of Blood Vessels

30 Questions

Exam 33

Human Cardiovascular Physiology: Blood Pressure and Pulse Determinations

30 Questions

Exam 34

Frog Cardiovascular Physiology

20 Questions

Exam 35

The Lymphatic System and Immune Response

23 Questions

Exam 36

Anatomy of the Respiratory System

26 Questions

Exam 37

Respiratory System Physiology

20 Questions

Exam 38

Anatomy of the Digestive System

26 Questions

Exam 39

Digestive System Processes: Chemical and Physical

22 Questions

Exam 40

Anatomy of the Urinary System

28 Questions

Exam 41

Urinalysis

14 Questions

Exam 42

Anatomy of the Reproductive System

30 Questions

Exam 43

Physiology of Reproduction: Gametogenesis and the Female Cycles

30 Questions

Exam 44

Survey of Embryonic Development

24 Questions

Exam 45

Principles of Heredity

25 Questions

Exam 46

Surface Anatomy Roundup

30 Questions

Show Answer