front 1 Cardiac output is __________.
| back 1 D)the amount of blood pumped out of each ventricle in one minute |
front 2 Choose the correct sequence of current flow through the heart wall.
| back 2 B)SA node, AV node, AV bundle, right and left bundle branches, Purkinje fibers |
front 3 During pulmonary circulation, blood leaves the __________.
| back 3 C)right ventricle and moves to the lungs |
front 4 During systemic circulation, blood leaves the __________.
| back 4 B)right ventricle and goes directly to the aorta |
front 5 Identify the correct sequence of blood flow through the chambers of the heart.
| back 5 D)right atrium, right ventricle, lungs, left atrium, left ventricle |
front 6 The absolute refractory period refers to the time during which __________.
| back 6 C)the muscle cell is not in a position to respond to a stimulus of any strength |
front 7 The cardiac cycle includes all of the following events EXCEPT __________.
| back 7 D)the number of times the heart beats in one minute |
front 8 The coronary arteries arise from the __________.
| back 8 D)aorta |
front 9 The endocardium is composed of __________.
| back 9 C)simple squamous epithelium |
front 10 The inferior vena cava brings blood from the lower regions of the body and empties into the __________.
| back 10 D)right atrium |
front 11 The inner lining of the fibrous pericardium is formed by the __________.
| back 11 D)parietal layer of serous pericardium |
front 12 The interventricular septum forms a dividing wall between the __________.
| back 12 E)left and right ventricles |
front 13 The normal pacemaker of the heart is the __________.
| back 13 C)SA node |
front 14 The tricuspid valve is located between the __________.
| back 14 E)right atrium and right ventricle |
front 15 When the mitral valve closes, it prevents the backflow of blood from the __________.
| back 15 B)left ventricle into the left atrium |
front 16 Which is the correct sequence of layers in the heart wall, starting with the outer layer?
| back 16 C)epicardium, myocardium, endocardium |
front 17 Which of the following statements is NOT true about the shape, position, and location of the heart?
| back 17 D)The heart is enclosed in a double-layered sac called the pleural membrane. |
front 18 The vessels that carry oxygen to the myocardium are called __________.
| back 18 C)coronary arteries |
front 19 The cells of the myocardium behave as a single, coordinated unit called a __________.
| back 19 E)functional syncytium |
front 20 The ability of some cardiac muscle cells to initiate their own depolarization and cause depolarization of the rest of the heart is called __________.
| back 20 A)automaticity |
front 21 Guided by powerful signaling molecules, the human heart develops from __________.
| back 21 B)mesoderm |
front 22 Which of the following structures lies on the outside surface of the heart and is an integral part of the cardiac wall?
| back 22 B)the epicardium |
front 23 The trabeculae carneae are located in the __________.
| back 23 C)ventricles |
front 24 What part of the heart is considered the systemic circuit pump?
| back 24 C)the left ventricle |
front 25 The __________ are attached to the AV valve flaps.
| back 25 C)chordae tendineae |
front 26 Which of the following valves is most often faulty in the heart?
| back 26 C)the mitral, or bicuspid, valve |
front 27 Which of the following factors gives the myocardium its high resistance to fatigue?
| back 27 D)a very large number of mitochondria in the cytoplasm |
front 28 The __________ nerve carries parasympathetic fibers to the sinoatrial (SA) node.
| back 28 B)vagus |
front 29 An enlarged R wave on an ECG would indicate __________.
| back 29 D)an enlarged ventricle |
front 30 A doctor puts his stethoscope on a patient's chest over the location of the heart and hears a swishing sound. Which of the following conditions is the best diagnosis for the patient's condition?
| back 30 A)incompetent cardiac valve |
front 31 Which of the following is NOT a role of the pericardium?
| back 31 D)It facilitates heart contraction. |
front 32 The lining of the heart chambers is called the __________.
| back 32 C)endocardium |
front 33 The superior chambers of the heart are called the __________.
| back 33 A)atria |
front 34 Freshly oxygenated blood is delivered to the __________ and then it passes into the __________ to be pumped to the entire body.
| back 34 D)left atrium; left ventricle |
front 35 Into which chamber of the heart do the pulmonary veins deliver blood?
| back 35 D)left atrium |
front 36 right marginal artery
| back 36 C)supplies blood to the lateral right side of the myocardium |
front 37 posterior interventricular artery
| back 37 D)runs to the apex of the heart |
front 38 anterior interventricular artery
| back 38 B)supplies blood to the interventricular septum and anterior walls of both ventricles |
front 39 circumflex artery
| back 39 A)supplies blood to the left atrium and posterior walls of the left ventricle |
front 40 The most muscular chamber of the heart is the __________.
| back 40 D)left ventricle |
front 41 tricuspid valve
| back 41 B)valve between the right atrium and right ventricle |
front 42 mitral valve
| back 42 D)valve between the left atrium and left ventricle |
front 43 aortic semilunar valve
| back 43 A)prevents backflow of blood into the left ventricle |
front 44 pulmonary semilunar valve
| back 44 C)prevents backflow of blood into the right ventricle |
front 45 Which of the following is a difference between cardiac muscle and skeletal muscle?
| back 45 A)Unlike skeletal muscle cells, cardiac muscle cells can be autorhythmic |
front 46 The role of the atrioventricular node (AV node) is to __________.
| back 46 B)initiate a sinus rhythm |
front 47 Which is correctly paired?
| back 47 D)ectopic focus: an abnormal pacemaker |
front 48 The P wave of an electrocardiogram represents __________.
| back 48 C)atrial depolarization |
front 49 The second heart sound (the 'dup' of 'lub-dup') is caused by the __________.
| back 49 D)closure of the semilunar valves |
front 50 cardiac cycle
| back 50 E)the events associated with blood flow through the heart during one complete heartbeat |
front 51 systole
| back 51 A)contraction |
front 52 diastole
| back 52 B)relaxation |
front 53 stroke volume
| back 53 C)the volume of blood pumped by one ventricle with each heartbeat |
front 54 cardiac output
| back 54 D)the amount of blood pumped by each ventricle in one minute |
front 55 Which of the following would lead to a decrease in heart rate?
| back 55 C)parasympathetic stimulation |
front 56 True or False
| back 56 True |