Cardiovascular System - Structure, Function, and Disorders

lOMoARcPSD|42936638 The purpose of the four valves of the heart is to ____. A) control the rate of blood flow B) ensure one-way blood flow C) keep the blood in the correct chamber D) maintain blood pressure E) generate rhythmic contractions Body cells surrounding capillaries usually have a ____. A) high oxygen concentration B) low oxygen concentration C) low carbon dioxide concentration D) high nutrient concentration E) low concentration of waste products Water is forced through capillary walls by ____. A) different concentrations of substances B) low pressure of the blood C) filtration D) osmosis E) diffusion In the clinical setting, blood pressure refers to _______. A) lymphatic pressure B) arterial pressure C) osmotic pressure D) venous pressure E) intracardiac pressure Blood pressure is greatest in the arteries ____. A) when the heart is between contraction and relaxation B) when the atria contract C) when the Purkinje fibers are stimulated D) when the SA node fires E) when the ventricles contract What causes a myocardial infarction? A) Damaged heart valves B) Weakened heart muscle C) Obstruction of blood flow to the heart muscle D) A serious dysrhythmia E) A defective SA node The ____ lies on top of the visceral pericardium. A) fibrous pericardium B) parietal pericardium C) myocardium D) endocardium E) epicardium lOMoARcPSD|42936638 Which of following is a membrane that covers the heart? A) Pericardium B) Myocardium C) Epicardium D) Endocardium E) Pericardial cavity The outermost layer of the heart wall, which contains fat that helps cushion the heart, is known as the _________. A) myocardium B) visceral pericardium C) parietal pericardium D) endocardium E) epicardium Which of the following is the thickest layer of the heart, which is made up of muscle? A) Epicardium B) Myocardium C) Endocardium D) Pericardium E) Pericardial cavity Which layer of the heart is the outermost layer, which contains fat to cushion the heart? A) Epicardium B) Myocardium C) Endocardium D) Pericardium E) Pericardial cavity Which of the following is the innermost layer of the heart, which is thin and smooth? A) Epicardium B) Myocardium C) Endocardium D) Pericardium E) Pericardial cavity Which of these layers of the heart wall contains Purkinje fibers? A) Epicardium B) Myocardium C) Endocardium D) Pericardium E) Pericardial cavity Which valve is between the left atrium and left ventricle? A) Tricuspid B) Bicuspid C) Pulmonary semilunar D) Aortic semilunar E) Right atrioventricular lOMoARcPSD|42936638 What is the name of the valve that is also known as the mitral valve? A) Tricuspid B) Bicuspid C) Pulmonary semilunar D) Aortic semilunar E) Right atrioventricular The ____ valve is between the right ventricle and the pulmonary trunk. A) tricuspid B) bicuspid C) pulmonary semilunar D) aortic semilunar E) right atrioventricular The ____ valve prevents blood from flowing back into the left ventricle. A) tricuspid B) bicuspid C) pulmonary semilunar D) aortic semilunar E) left atrioventricular Which of the following valves prevents blood from flowing back into the right ventricle? A) Tricuspid B) Bicuspid C) Pulmonary semilunar D) Aortic semilunar E) Left atrioventricular Which component of the cardiac conduction system is located between the ventricles and splits into left and right branches? A) SA node B) AV node C) Bundle of His D) Purkinje fibers E) Bundle branches Which part of the cardiac conduction system is located in the wall of the right atrium? A) SA node B) AV node C) Bundle of His D) Purkinje fibers E) Bundle branches Which part of the cardiac conduction system is known as the pacemaker of the heart? A) SA node B) AV node C) Bundle of His D) Purkinje fibers E) Bundle branches