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 or intercalated discs or 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 _______________________
			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			A failure of the ductus arteriosus to close at the time of birth is called a/n __________ ductus arteriosus.
			A)	stenotic
			B)	congestive
			C)	prolapsed
			D)	patent
12			What is the name of the heart valve that is often damaged during rheumatic fever and can prolapse causing problems?
			A)	right AV
			B)	aortic
			C)	left AV or mitral
			D)	pulmonary
13			Which chamber of the heart normally must work harder as the heart ages?
			A)	right atrium
			B)	left atrium
			C)	right ventricle
			D)	left ventricle
14			The leading cause of death in the United States is ___________________________.
			A)	heart disease
			B)	smoking
			C)	stroke
			D)	cancer
15			The stimulation of this parasympathetic carrying nerve should _________________ heart rate and strength.
			A)	speed up
			B)	slow down
			C)	remain the same