21) Large cardiac cells of the conducting system embedded in the ventricular walls between the endocardium and myocardium.
A) atrioventricular bundle
B) atrioventricular branches
C) subendocardial conducting network (Purkinje fibers)
D) sinoatrial node
E) atrioventricular node
22) Parasympathetic impulses to the SA node are transmitted on this cranial nerve.
A) Glossopharyngeal nerve
B) Accessory nerve—spinal part
C) Vagus nerve
D) Trigeminal nerve
E) Hypoglossal nerve
23) Coronary artery that supplies the left atrium.
A) circumflex artery
B) left anterior descending artery
C) marginal artery
D) posterior descending artery
E) pulmonary artery
24) Death of heart musculature due to lack of oxygen.
A) cardiac tamponade
B) valve insufficiency
C) heart block
D) myocardial infarction
E) ventricular fibrillation
25) Enlargement of the heart with progressive decline in pumping efficiency.
A) cardiac tamponade
B) congestive heart failure
C) heart block
D) myocardial infarction
E) hypertrophic cardiomyopathy
26) The pericardial cavity lies between
A) the fibrous pericardium and the parietal pericardium.
B) the parietal pericardium and the visceral pericardium.
C) the serous pericardium and the epicardium.
D) the fibrous pericardium and the diaphragm.
27) How did the sinoatrial (SA) node most likely get its name?
A) It is on the side of the atrium.
B) It lies at the opening of the coronary sinus.
C) It is damaged by sinus infections (head colds).
D) It develops from the sinus venosus and lies in an atrium.
28) A penetrating stab wound to the heart wall that causes blood to leak into the pericardial cavity would result in
A) cardiac tamponade.
B) myocardial infarction.
C) hypertrophic cardiomyopathy.
D) endocarditis.
29) The inner endothelial layer that lines the heart is the
A) epicardium.
B) pericardium.
C) myocardium.
D) endocardium.
30) Which of the following vessels does
not
carry oxygen-poor blood to the heart?
A) the superior vena cava
B) the inferior vena cava
C) the pulmonary vein
D) the coronary sinus