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Ch. 18

front 1 1) Normal heart sounds are caused by which of the following events? A) excitation of the SA node B) closure of the heart valves C) friction of blood against the chamber walls D) opening and closing of the heart valves	back 1 B
front 2 2) Which of the events below does not occur when the semilunar valves are open? A) Ventricles are in diastole. B) Blood enters pulmonary arteries and the aorta. C) AV valves are closed. D) Ventricles are in systole.	back 2 A
front 3 3) Hemorrhage with a large loss of blood causes ________. A) a lowering of blood pressure due to change in cardiac output B) a rise in blood pressure due to change in cardiac output C) no change in blood pressure but a slower heart rate D) no change in blood pressure but a change in respiration	back 3 A
front 4 4) The left ventricular wall of the heart is thicker than the right wall in order to ________. A) accommodate a greater volume of blood B) expand the thoracic cage during diastole C) pump blood with greater pressure D) pump blood through a smaller valve	back 4 C

front 5 5) Damage to the ________ is referred to as heart block. A) SA node B) AV valves C) AV bundle D) AV node	back 5 D
front 6 6) The P wave of a normal electrocardiogram indicates ________. A) ventricular repolarization B) ventricular depolarization C) atrial repolarization D) atrial depolarization	back 6 D
front 7 7) Blood within the pulmonary veins returns to the ________. A) right atrium B) left atrium C) right ventricle D) left ventricle	back 7 B
front 8 8) Small muscle masses attached to the chordae tendineae are the ________. A) trabeculae carneae B) pectinate muscles C) papillary muscles D) venae cavae	back 8 C

front 9 9) The term for pain associated with deficient blood delivery to the heart that may be caused by the transient spasm of coronary arteries is ________. A) ischemia B) pericarditis C) myocardial infarct D) angina pectoris	back 9 D
front 10 10) To auscultate the aortic semilunar valve, you would place your stethoscope in the ________. A) second intercostal space to the right of the sternum B) second intercostal space to the left of the sternum C) fifth intercostal space inferior to the left nipple D) fifth right intercostal space	back 10 A
front 11 11) The source of blood carried to capillaries in the myocardium would be the ________. A) coronary sinus B) fossa ovalis C) coronary arteries D) coronary veins	back 11 C
front 12 12) The fact that the left ventricle of the heart is thicker than the right ventricle reveals that it ________. A) pumps a greater volume of blood B) pumps blood against a greater resistance C) expands the thoracic cage D) sends blood through a smaller valve	back 12 B

front 13 13) Which of the following factors does not influence heart rate? A) skin color B) age C) gender D) body temperature	back 13 A
front 14 14) Which of the following is not an age-related change affecting the heart? A) atherosclerosis B) decline in cardiac reserve C) fibrosis of cardiac muscle D) thinning of the valve flaps	back 14 D
front 15 15) If cardiac muscle is deprived of its normal blood supply, damage would primarily result from ________. A) decreased delivery of oxygen B) a decrease in the number of available mitochondria for energy production C) a lack of nutrients to feed into metabolic pathways D) an inadequate supply of lactic acid	back 15 A
front 16 16) If the length of the absolute refractory period in cardiac muscle cells was the same as it is for skeletal muscle cells ________. A) it would be much longer before cardiac cells could respond to a second stimulation B) contractions would last as long as the refractory period C) tetanic contractions might occur, which would stop the heart's pumping action D) it would be less than 12 ms	back 16 C

front 17 17) Norepinephrine acts on the heart by ________. A) decreasing heart contractility B) causing a decrease in stroke volume C) blocking the action of calcium D) causing threshold to be reached more quickly	back 17 D
front 18 18) If the vagal nerves to the heart were cut, the result would be that ________. A) the heart would stop, since the vagal nerves trigger the heart to contract B) the heart rate would increase by about 25 beats per minute C) the AV node would become the pacemaker of the heart D) parasympathetic stimulation would increase, causing a decrease in heart rate	back 18 B
front 19 19) Foramen ovale ________. A) connects the two atria in the fetal heart B) is a condition in which the heart valves do not completely close C) is a shallow depression in the interventricular septum D) is a connection between the pulmonary trunk and the aorta in the fetus	back 19 A
front 20 20) Which vessel of the heart receives blood during right ventricular systole? A) venae cavae B) pulmonary trunk C) aorta D) pulmonary veins	back 20 B

front 21 21) Which of these vessels receives blood during ventricular systole? A) aorta only B) pulmonary arteries only C) pulmonary veins only D) both the aorta and pulmonary trunk	back 21 D
front 22 22) 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	back 22 C
front 23 23) 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	back 23 B
front 24 24) When viewing a dissected heart, it is easy to visually discern the right and left ventricles by ________. A) tracing out where the auricles connect B) noticing the thickness of the ventricle walls C) locating the apex D) finding the papillary muscles	back 24 B

front 25 25) 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) Aortic and pulmonary valves control the flow of blood into the heart. D) The AV valves are supported by chordae tendineae so that regurgitation of blood into the atria during ventricular contraction does not occur.	back 25 D
front 26 26) Select the correct statement about the function of myocardial cells. A) The entire heart contracts as a unit or it does not contract at all. B) Each cardiac muscle cell is innervated by a sympathetic nerve ending so that the nervous system can increase heart rate. C) The refractory period in skeletal muscle is much longer than that in cardiac muscle. D) The influx of potassium ions from extracellular sources is the initiating event in cardiac muscle contraction.	back 26 A
front 27 27) 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.	back 27 D
front 28 28) Compared to skeletal muscle, cardiac muscle ________. A) has gap junctions that allow it to act as a functional syncytium B) lacks striations C) has more nuclei per cell D) cells are larger than skeletal muscle cells	back 28 A

front 29 29) During the period of ventricular filling ________. A) pressure in the heart is at its peak B) blood flows passively through the atria and the open AV valves into the ventricles C) the atria remain in diastole D) it is represented by the P wave on the ECG	back 29 B
front 30 30) The second heart sound is heard during which phase of the cardiac cycle? A) isovolumetric relaxation B) isovolumetric contraction C) ventricular ejection D) ventricular filling	back 30 A
front 31 31) The time of day most hazardous for heart attacks is ________. A) morning B) noontime C) evening D) during sleep	back 31 A
front 32 32) If we were able to artificially alter the membrane permeability of pacemaker cells so that sodium influx is more rapid, ________. A) threshold is reached more quickly and heart rate would increase B) potassium channels compensate and no change in heart rate would occur C) heart rate would decrease, but blood pressure would rise due to the excess sodium present D) tetanic contraction would occur due to the short absolute refractory period of cardiac muscle	back 32 A

front 33 33) Select the correct statement about cardiac output. A) A slow heart rate increases end diastolic volume, stroke volume, and force of contraction. B) Decreased venous return will result in increased end diastolic volume. C) If a semilunar valve were partially obstructed, the end systolic volume in the affected ventricle would be decreased. D) Stroke volume increases if end diastolic volume decreases.	back 33 A
front 34 34) During contraction of heart muscle cells ________. A) the action potential is initiated by voltage-gated slow calcium channels B) some calcium enters the cell from the extracellular space and triggers the release of larger amounts of calcium from intracellular stores C) the action potential is prevented from spreading from cell to cell by gap junctions D) calcium is prevented from entering cardiac fibers that have been stimulated	back 34 B
front 35 35) Isovolumetric contraction ________. A) refers to the short period during ventricular systole when the ventricles are completely closed chambers B) occurs while the AV valves are open C) occurs immediately after the aortic and pulmonary valves close D) occurs only in people with heart valve defects	back 35 A
front 36 36) Commotio cordis is heart failure due to a ________. A) mild electrical shock to the heart itself B) severe electrical shock to the body C) relatively mild blow to the chest that occurs during a vulnerable interval (2 ms) when the heart is repolarizing D) loss of blood from an artery	back 36 C