Chapter 20 Heart

18) ___ is to slow heart rate as ___ is to fast heart rate. A) Bradycardia; tachycardia B) Cardiac tamponade; bradycardia C) Bradycardia; cardiomyopathy D) Tachycardia; bradycardia E) none of the above

A) Bradycardia; tachycardia

6) The heart is innervated by ___ nerves. A) both parasympathetic and sympathetic B) neither parasympathetic nor sympathetic C) somatomotor D) sympathetic E) parasympathetic

A) both parasympathetic and sympathetic

11) Analysis of the electrocardiogram can reveal all of the following, except the A) duration of the ventricular action potential. B) stroke volume. C) effects of drugs and poisons. D) heart rate. E) condition of the conducting system.

B

17) When the semilunar valves close, the AV valves then A) make the third heart sound. B) open. C) close. D) both B and C. E) both A and C.

B

5) The bicuspid or mitral valve is located A) between the right atrium and right ventricle. B) between the left atrium and left ventricle. C) in the opening of the aorta. D) where the venae cavae join the right atrium. E) in the opening of the pulmonary trunk.

B) between the left atrium and left ventricle.

16) The heart beats approximately ___ times each day. A) 1,000 B) 10,000 C) 100,000 D) 1,000,000 E) 10,000,000

C

8) The following are structural components of the conducting system of the heart. 1. Purkinje fibers 2. AV bundle 3. AV node 4. SA node 5. bundle branches sequence in which excitation would move through this system is A) 1, 4, 3, 2, 5. B) 3, 2, 4, 5, 1. C) 4, 3, 2, 5, 1. D) 4, 2, 3, 5, 1. E) 3, 5, 4, 2, 1.

C) 4, 3, 2, 5, 1.

12) The first heart sound IS heard when the A) atria contract B) AV valves open. C) blood enters the aorta. D) AV valves close. E) semilunar valves close.

D) AV valves close.

19) Stroke volume depends on A) the pressure required to pump blood into the aorta. B) end diastolic volume. C) the contractility of the ventricle. D) A and B only E) A, B, and C.

E

3) Contractions of the papillary muscles A) close the Semilunar valves. B) close the atrioventricular valves. C) eject blood from the ventricles. D) eject blood from the atria into the ventricles. E) prevent the atrioventricular valves from reversing into the atria.

E

14) Which of the following would increase heart rate? A) faster depolarization of the pacemaker potential B) increased sympathetic stimulation of SA node C) decreased parasympathetic stimulation of nodal fibers D) increased levels of epinephrine E) all of the above

E) all of the above

9) The P wave of the electrocardiogram is a signal from A) depolarization of the AV node. B) depolarization of the atria. C) repolarization of the atria. D) depolarization of the ventricles. E) depolarization of the SA node.

B) depolarization of the atria.

10) Depolarization of the ventricles is represented on an electrocardiogram by the A) P wave. B) PR complex. C) QRS complex. D) T wave. E) S wave.

C) QRS complex.

15) Artery is to ___ as vein is to ___ A) afferent; away . B) afferent; efferent C) efferent; afferent D) toward; away E) none of the above

C) efferent; afferent

13) Each of the following factors will increase cardiac output, except A) increased sympathetic stimulation. B) increased venous return. C) increased parasympathetic stimulation D) increased heart rate. E) both A and B

C) increased parasympathetic stimulation

1) Blood returning to the heart from the systemic circuit first enters the A) left atrium. B) left ventricle. C) right atrium. D) conus arteriosus. E) right ventricle.

C) right atrium.

20) The volume of blood ejected from each ventricle during a contraction is called the A) cardiac output. B) cardiac reserve. C) stroke volume. D) end systolic-volume. E) end-diastolic volume

C) stroke volume.

4) Most of the middle layer in the heart wall is composed of A) epitheliocytes. B) smooth muscle cells. C) chondrocytes. D) cardiac muscle cells. E) fibrocytes.

D

2) Blood returning to the heart from the pulmonary circuit first enters the A) right ventricle. B) left ventricle. C) conns arteriosus. D) left atrium. E) right atrium.

D) left atrium.

7) The normal pacemaker of the heart is located in the A) Purkinje fibers. B) both the left and right ventricles. C) Wall of the left ventricle. D) sinoatrial node. E) atrioventricular node

D) sinoatrial node.