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Unformatted text preview: Unit 4 Practice Exam The Heart MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) Blood within the pulmonary veins returns to the: A) right atrium. B) left atrium. C) right ventricle. D) left ventricle. 2) Blood is carried to capillaries in the myocardium by way of: A) the coronary sinus. B) the fossa ovalis. C) coronary arteries. D) coronary veins. 3) Select the correct statement about the structure of the heart wall. A) The fibrous skeleton forms the bulk of the heart. B) Connective tissue in the heart wall aids in the conduction of the action potential. C) The heart chambers are lined by the endomysium. D) The myocardium is the layer of the heart that actually contracts. 4) The action potential seen in cardiac muscle differs from the action potential of skeletal muscles by: A) There is a depolarization B) There is a plateau C) There is a repolarization D) There is a resting membrane potential 5) During the period of ventricular filling: A) pressure in the heart is at its peak. B) blood flows passively from the atria to the ventricles through open AV valves. C) the atria remain in diastole. D) it is represented by the P wave on the ECG. 6) Compared to skeletal muscle, cardiac muscle: A) has gap junctions that allow the cells to contract in a synchronized manner. B) lacks striations. C) has more nuclei per cell. D) cells are larger than skeletal muscle cells. 7) Select the correct statement about the heart valves. A) The mitral valve separates the right atrium from the right ventricle. B) The tricuspid valve divides the left atrium from the left ventricle. C) Semilunar valves control the flow of blood into the heart. D) The AV valves are supported by chordae tendineae so that they do not blow back up into the atria during ventricular contraction. 8) Which of the following is not part of the conduction system of the heart? A) AV node B) bundle of His C) AV valve D) SA node 9) When holding a dissected heart in your hands, it is easy to orient the right and left side by: A) tracing out where the vena cava enters the heart. B) noticing the thickness of the ventricle walls. C) locating the aorta. D) finding the pulmonary semilunar valves. 10) The tricuspid valve is closed: A) while the ventricle is in diastole. B) when the ventricle is in systole. C) while the atrium is contracting. D) by the movement of blood from atrium to ventricle. 11) Which vessel of the heart receives blood during right ventricular systole? A) venae cavae B) pulmonary trunk C) aorta D) pulmonary veins 12) Blood enters which of these vessels during ventricular systole? A) aorta B) pulmonary arteries C) pulmonary vein D) aorta and pulmonary trunk 13) Foramen ovale: A) connects the two atria in the fetal heart....
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- Spring '11