EXAM 2 MASTERING QUESTIONS GAURANTEED PASS WITH DETAILED SOULTIONS, Exams of Health sciences

Download EXAM 2 MASTERING QUESTIONS GAURANTEED PASS WITH DETAILED SOULTIONS and more Exams Health sciences in PDF only on Docsity! EXAM 2 MASTERING QUESTIONS GAURANTEED PASS WITH DETAILED SOULTIONS What is the period during the cardiac cycle when the valves leading to and from the ventricles are completely closed and blood volume in the ventricles remains constant as the walls contract? isovolumetric contraction phase During which of these stages are the aortic and pulmonary valves open? phase 2b Which best describes the isovolumetric contraction phase of the cardiac cycle? As ventricular systole starts, the AV valves are closed and the semilunar valves are closed. Because the ventricles are contracting and both valves are closed, pressure increases rapidly leading to ejection. As soon as ventricular pressure falls below atrial pressure, the atrioventricular valve will open and ventricular filling will begin. true During the isovolumetric relaxation phase of the cardiac cycle, ______. atrioventricular, aortic, and pulmonary valves are closed Isovolumetric contraction ________. refers to the short period during ventricular systole when the ventricles are completely closed chambers Refer to Focus Figure 18.2, specifically the pressure in the left atrium. Which statement best explains the second rise in atrial pressure on the line graph? The bicuspid/mitral valve closes; blood is contained within the closed chamber, exerting pressure against the atrial wall. Refer to Focus Figure 18.2, specifically the graph reflecting pressure changes in the cardiac cycle. Why is the dicrotic notch important? Reflects an increase in aortic pressure as blood rebounds against the closed aortic semilunar valve What is the main function of heart valves? prevent the backward flow of blood When the atria contract, which of the following is true? The ventricles are in diastole Which of the following is equivalent to the ventricular volume during isovolumetric contraction? The end diastolic volume (EDV) Which of the following is true during ventricular systole? The AV valves are closed. During the ventricular ejection phase of the cardiac cycle, which of the following is true? The semilunar valves are open. Most of the decrease in ventricular volume takes place during which phase of the cardiac cycle? ventricular ejection Which of the following is equivalent to the ventricular volume during isovolumetric relaxation? end systolic volume (ESV) Most of the increase in left ventricular volume takes place during what phase of the cardiac cycle? ventricular filling In what direction does blood flow through the heart? from a region of high pressure to a region of low pressure Atrial pressure is greater than ventricular pressure during which phase of the cardiac cycle? atrial contraction At what point during the cardiac cycle does the AV valve close? when ventricular pressure becomes greater than atrial pressure At what point in the cardiac cycle does the semilunar valve open? when ventricular pressure becomes greater than aortic pressure Ventricular pressure is greater than aortic pressure during which phase of the cardiac cycle? ventricular ejection At what point in the cardiac cycle does the semilunar valve close? when pressure in the ventricle becomes less than aortic pressure Isovolumetric relaxation is characterized by which of the following? The semilunar and AV valves are closed At what point in the cardiac cycle does the AV valve open? when atrial pressure becomes greater than ventricular pressure