NUR 2048- Exam 1 questions with correct answers

What is perfusion? - Answer Blood flow through the arteries and capillaries to help deliver nutrients and oxygen to the cells in the body What is systole? - Answer - Phase in which the ventricles contract causing pressure that closes the mitral and tricuspid valves which prevents blood from flowing back into the atria - The pressure then causes the aortic and pulmonic valves to open causing ejection of the blood into the aorta and pulmonary arteries What is ejection fraction? - Answer Measurement of blood leaving the left ventricle each time it contracts Average ejection fraction - Answer 50-70% What is diastole? - Answer Aortic and pulmonic valves close. The ventricles then begin to passively fill with blood Equation for cardiac output - Answer heart rate x stroke volume What are the 3 components of stroke volume - Answer - Preload - Afterload - Contractility What is preload? - Answer Refers to the end diastolic volume in the heart or the amount of blood in the ventricles at the end of diastole