Choose the best answer.

1			If the chordae tendinae of an animal's heart were cut, the most likely effect would be
			A)	valvular prolapse.
			B)	fibrillation.
			C)	heart block.
			D)	myocardial infarction.
2			In contrast to skeletal muscle, cardiac muscle has
			A)	a more extensive sarcoplasmic reticulum.
			B)	numerous nuclei per cell.
			C)	gap junctions between cells.
			D)	longer fibers.
3			A myocardial infarction
			A)	is the sudden death of cardiac tissue.
			B)	is due to a bundle branch block.
			C)	results from an enlarged left ventricle.
			D)	is related to a mitral valve prolapse.
4			What is an atheroma?
			A)	It is immediate death of cardiac tissue due to oxygen deprivation.
			B)	It is a blockage of a coronary artery.
			C)	It is a blood clot that originates in a vessel in the heart.
			D)	It is an atherosclerotic plaque.
5			Chest pain due to inadequate supply of blood to heart muscle tissue is called
			A)	cardiac tamponade.
			B)	myocardial infarction.
			C)	angina pectoris.
			D)	ventricular fibrillation.
6			Which of the following is not true of cardiac myocytes?
			A)	They are joined by intercalated discs.
			B)	They have T tubules that admit extracellular calcium.
			C)	They are relatively long and striated.
			D)	They usually have one nucleus.
7			What condition is the result of one ventricle pumping more blood than the other resulting in edema in peripheral tissues?
			A)	rheumatic fever
			B)	myocardial infarction
			C)	cardiac tamponade
			D)	congestive heart failure
			E)	mitral valve prolapse
8			When are the semilunar valves closed?
			A)	when the ventricles are contracting
			B)	when the ventricles are relaxing
			C)	when the atrioventricular valves are closed
			D)	when the atria are relaxing
9			What results from sympathetic stimulation to the heart?
			A)	decreased cardiac output
			B)	decreased heart rate
			C)	increased heart rate and force
			D)	decreased intraventricular pressure
10			The superior part of the embryonic bulbus cordis and truncus arteriosus gives rise to what structures?
			A)	the right and left atria
			B)	the right atrium and right ventricle
			C)	the pulmonary trunk and ascending aorta
			D)	the left atrium and left ventricle
11			If the heart's normal pacemaker became nonfunctional and the AV node took over the heart rate would be around 90 beats per minute.
			A)	True
			B)	False
12			The outer, fibrous covering of the heart that is made up of dense irregular connective tissue is the visceral pericardium.
			A)	True
			B)	False
13			The trabeculae carnae pull on the chordae tendinae and hold them taut during ventricular contraction.
			A)	True
			B)	False
14			The blood returns from the lungs to the heart via the pulmonary arteries.
			A)	True
			B)	False
15			Which vessel supplies blood to both ventricles and the anterior interventricular septum?
			A)	the right coronary artery
			B)	the anterior interventricular branch
			C)	the circumflex branch
			D)	the posterior interventricular branch
16			The sinoatrial (SA) node sets the rate of the heart beat.
			A)	True
			B)	False
17			The effect of vagus nerve stimulation is to increase heart rate and force of contraction.
			A)	True
			B)	False
18			Blood in the pulmonary veins returns to the right atrium.
			A)	True
			B)	False
19			The superior part of the heart from which the great vessels arrise is the apex.
			A)	True
			B)	False
20			Another name for the visceral pericardium is endocardium.
			A)	True
			B)	False