ANATOMY HEART MULTIPLE CHOICE QUESTIONS WITH CORRECT SOLUTIONS

ANATOMY HEART MULTIPLE CHOICE QUESTIONS WITH CORRECT SOLUTIONS "During pulmonary circulation blood leaves the - right ventricle and goes directly to the aorta. - right ventricle and moves to the lungs. - right atrium and goes directly to the left ventricle. - right atrium and goes directly to the lungs. - left ventricle and moves to the lungs. - CORRECT ANSWER - right ventricle and moves to the lungs." "Identify the correct sequence of blood flow through the chambers of the heart. - Lungs, right ventricle, left ventricle, right atrium, left atrium - Right ventricle, left ventricle, left atrium, lungs, right atrium - Left atrium, left ventricle, right ventricle, right atrium, and lungs - Right atrium, right ventricle, lungs, left atrium, left ventricle - Left ventricle, left atrium, lungs, right ventricle, right atrium - CORRECT ANSWER - Right atrium, right ventricle, lungs, left atrium, left ventricle" "The absolute refractory period refers to the time during which - the muscle cell is ready to respond to a threshold stimulus. - a skeletal muscle cannot respond to any stimulus and lasts about 250 ms. - a cardiac muscle cannot respond to any stimulus and lasts only 1 to 2 milliseconds. - the muscle cell is ready to respond to any stimulus. - the muscle cell is NOT in a position to respond to a stimulus of any strength. - CORRECT ANSWER - the muscle cell is NOT in a position to respond to a stimulus of any strength." "The coronary arteries arise from the - aorta. - inferior vena cava. - superior vena cava. - right atrium. - pulmonary trunk. - CORRECT ANSWER - aorta." "The endocardium is composed of - simple cuboidal epithelium. - simple squamous epithelium. - cardiac muscle cells. - simple columnar epithelium. - stratified squamous epithelium. - CORRECT ANSWER - simple squamous epithelium." "The inferior vena cava brings blood from the lower regions of the body and empties into the - left atrium. - right atrium. - Aorta. - left ventricle. - right ventricle. - CORRECT ANSWER - right atrium." "The inner lining of the fibrous pericardium is formed by the - pericardial cavity. - myocardium. - diaphragm. - endocardium. - parietal layer of serous pericardium. - epicardium. - CORRECT ANSWER - parietal layer of serous pericardium." "The pacemaker of the heart is the - Purkinje fibers. - the bundle branches. - Bundle of His. - AV node. - SA node. - CORRECT ANSWER - SA node." "When the mitral valve closes, it prevents the backflow of blood from the - left atrium into the left ventricle. - left ventricle into the left atrium. - right atrium into the right ventricle. - left ventricle into the aorta. - right ventricle into the pulmonary trunk. - CORRECT ANSWER - left ventricle into the left atrium." "Which of the following statements is NOT true about the shape, position and location of the heart? - The heart is located between the two lungs within the mediastinum. - Approximately two-thirds of the heart is found to the left of the midline. - The heart is enclosed in a double-layered sac called the pleural membrane. - The heart is shaped like a cone with the base facing the right shoulder. - CORRECT ANSWER - The heart is enclosed in a double-layered sac called the pleural membrane." "Which of the following drains blood DIRECTLY from the myocardium? - Right coronary artery - Middle cardiac vein - SVC - IVC - Coronary sinus - CORRECT ANSWER - Middle cardiac vein" "Which of the following structures lies on the outside surface of the heart and is an integral part of the cardiac wall? - the epicardium - The parietal layer of serous pericardium - the fibrous pericardium - the pericardial sac - CORRECT ANSWER - the epicardium" "What part of the heart is considered the systemic circuit pump? - the right atrium - the right ventricle - the left atrium - the left ventricle - CORRECT ANSWER - the left ventricle" "If the circumflex artery of the heart was blocked, the myocardium in the _________________ would be ischemic. - the left atrium and the posterior wall of the left ventricle - the apex - the lateral aspects of the heart - interventricular septum and the anterior wall of the ventricles - CORRECT ANSWER - the left atrium and the posterior wall of the left ventricle" "Blood spurts back into the _____________ when the right atrium contracts. - aorta - pulmonary trunk - venae cavae - pulmonary veins - CORRECT ANSWER - venae cavae" "Which of the following factors gives the myocardium its high resistance to fatigue? - the presence of intercalated discs - a very large number of mitochondrion in the cytoplasm - gap junctions - the coronary circulation - CORRECT ANSWER - a very large number of mitochondrion in the cytoplasm" "All but which of the following statements about autorhythmic myocardial cells are correct? - They do not maintain a stable resting membrane potential. - They have special ion channels in their sarcolemma. - They are the first myocardial cells to contract. - They make up the intrinsic cardiac conduction system. - CORRECT ANSWER - They are the first myocardial cells to contract." "The lining of the heart chambers is called the: - myocardium. - epicardium. - pericardium. - endocardium. - CORRECT ANSWER - endocardium." "Freshly oxygenated blood is delivered to the _____ and then it passes into the _______, to be pumped to the entire body. - left ventricle; left atrium - right ventricle; right atrium - left atrium; left ventricle - right atrium; right ventricle - CORRECT ANSWER - left atrium; left ventricle" "The most muscular chamber of the heart is the ________. - right atrium - left atrium - right ventricle - left ventricle - CORRECT ANSWER - left ventricle" "Which of the following is a difference between cardiac muscle and skeletal muscle? - Unlike skeletal muscle cells, cardiac muscle cells do not rely on an influx of calcium ions for depolarization. - Unlike skeletal muscle, cardiac muscle does not use a sliding filament mechanism for contraction. - Unlike skeletal muscle, cardiac muscle is not striated. - Unlike skeletal muscle cells, cardiac muscle cells can be autorhythmic. - CORRECT ANSWER - Unlike skeletal muscle cells, cardiac muscle cells can be autorhythmic." “Choose the correct sequence of current flow through the heart wall. - AV node, SA node, Purkinje fibers, AV bundle of His, right and left bundle branches - SA node, AV node, AV bundle of His, right and left bundle branches, Purkinje fibers - SA node, Purkinje fibers, AV node, AV bundle of His, right and left bundle branches - AV node, Purkinje fibers, AV node, AV bundle of His, right and left bundle branches - Purkinje fibers, AV node, AV bundle of His, right and left bundle branches, SA node - CORRECT ANSWER - SA node, AV node, AV bundle of His, right and left bundle branches, Purkinje fibers" "During systemic circulation, blood leaves the - left ventricle and goes directly to the aorta. - right ventricle and goes directly to the aorta. - right ventricle and moves to the lungs. - lungs and moves to the left atrium. - right atrium and goes directly to the lungs. - CORRECT ANSWER - left ventricle and goes directly to the aorta." "The cardiac cycle includes all of the following events EXCEPT - the movement of impulse from the SA node to all regions of the heart wall. - the closing and opening of the heart valves during each heart beat. - the number of times the heart beats in one minute. - the changes in pressure gradients in all chambers of the heart. - the changes in blood volume in all chambers of the heart. - CORRECT ANSWER - the number of times the heart beats in one minute." "The interventricular septum forms a dividing wall between the - left atrium and left ventricle. - left atrium and right atrium. - right ventricle and left atrium. - right atrium and right ventricle. - left and right ventricles. - CORRECT ANSWER - left and right ventricles." "The tricuspid valve is located between the - right and left atria. - right and left ventricles. - right atrium and right ventricle. - left atrium and left ventricle. - right ventricle and the aorta. - CORRECT ANSWER - right atrium and right ventricle." "Which is the correct sequence of layers in the heart wall, starting with the outer layer? - Parietal pericardium, myocardium, endocardium - Endocardium, epicardium, myocardium - Myocardium, pericardium, endocardium - Endocardium, smooth muscle, epicardium - Epicardium, myocardium, endocardium - CORRECT ANSWER - Epicardium, myocardium, endocardium" "The vessels that carry oxygen to the myocardial cells are called - aortic arteries. - pulmonary arteries. - pulmonary veins. - coronary veins. - coronary arteries. - CORRECT ANSWER - coronary arteries." "Which of the following structures is continuous with the inner lining of blood vessels? - the pectinate muscles - the pericardial sac - the epicardium - the endocardium - CORRECT ANSWER - the endocardium" "The fossa ovalis is located in the - interventricular septum. - atrium. - ventricle. - interatrial septum. - CORRECT ANSWER - interatrial septum." "The trabeculae carneae are located in the - endocardium. - atrium. - epicardium. - ventricles. - CORRECT ANSWER - ventricles." "Attached to the AV valve flaps are the - trabeculae carneae. - papillary muscles. - chordae tendineae. - pectinate muscles. - CORRECT ANSWER - chordae tendineae." "Which of the following valves is most often faulty in the heart? - the aortic semilunar valve - the tricuspid valve - the pulmonary semilunar valve - the mitral or bicuspid valve - CORRECT ANSWER - the mitral or bicuspid valve" "The myocardium functions as a functional syncytium due to - the presence of striations in the myocardium. - branching of myocardial cells. - the presence of gap junctions. - the presence of desmosomes. - CORRECT ANSWER - the presence of gap junctions." "Autorhythmic cardiac cells are found in all the following location except the - SA node. - interatrial septum. - Purkinje cells. - AV node. - CORRECT ANSWER - interatrial septum." "The cardioacceleratory center fibers are part of the - cranial peripheral nervous system. - somatic peripheral nervous system. - sympathetic nervous system. - parasympathetic nervous system. - CORRECT ANSWER - sympathetic nervous system." "The superior chambers of the heart are called the: - ventricles. - superior sulci. - atria. - coronary chambers. - CORRECT ANSWER - atria." "Into which chamber of the heart do the pulmonary veins deliver blood? - Left ventricle - Left atrium - Right atrium - Right ventricle - CORRECT ANSWER - Left atrium"