10. For more practice, put the events of the Cardiac Cycle in the most correct order starting with depolarization of the SA node to threshold. Some events may be missing. (Hint: the video answering Extra Study Question for Cardiac Physiology 21 posted after Cardiac Physiology video 9 on D2L will help you understand this, but you should realize this question is a changed question) 1. depolarization of the atria 2. beginning of P wave of EKG 3. first heart sound 4. ejection of blood out of the ventricle 5. highest atrial pressure 6. ventricular pressure becomes less than aortic pressure 7. ventricular pressure becomes less than atrial pressure 8. beginning of T wave of EKG 9. closure of AV valve 10. ventricular pressure rises above aortic pressure 11. second heart sound 12. opening of semilunar valve 13. beginning of QRS complex of EKG 14. opening of AV valve 15. ventricular pressure rises above atrial pressure 16. ventricular filling begins A. 1, 5, 2, 13, 15, 3, 9, 10, 12, 4, 8, 6, 11, 7, 14, 16 B. 1, 2, 5, 13, 15, 9, 10, 12, 3, 4, 8, 6, 7, 14, 16, 11 C. 1, 2, 5, 16, 13, 15, 9, 3, 10, 12, 4, 8, 6, 11, 7, 14 (be careful and learn from this choice!!) D. 1, 2, 5, 13, 15, 9, 3, 10, 12, 4, 8, 6, 11, 7, 14, 16 11. Many students seem challenged when determining during what part of the Cardiac Cycle a murmur occurs due to heart valve abnormality. Therefore, this question is to give you practice with that. Use Challenge Question 17 and the Reading for that Question to learn about murmurs. (Page 289 of the Course Pack also helps) Which of the following is most likely to cause a heart murmur that occurs during ventricular systole? (Hint: an "insufficient" valve causes regurgitation) A) aortic valve regurgitation B) aortic valve stenosis A) An important function of Starling's Law of B) Increased end diastolic volume increases 12. Select the LEAST correct or NOT a correct statement. the Heart is to keep the output of the two ventricles equal. stroke volume by an intrinsic mechanism. C) Contractility is an increase in force of contraction which due to (caused by) a change in end diastolic volume. D) Increased sympathetic stimulation of the heart increases contractility.