4. Why are coronary arteries so easily blocked by floating embolisms? 5.One of the first diagnostic tools used at the hospital was an electrocardiogram (EKG or ECG), which reflects the electrical activity of the cardiac muscle. We know that the atrial contract first (the P wave) and then, after a brief delay, the ventricles contract (the QRS complex). Given that the heart does not have any nerves to stimulate the cardiac muscle cells, how is the timing of contraction coordinated? 6.Before his untimely death, Peter's Uncle Ben was diagnosed with a heart murmur. His primary care physician caught it during a routine checkup. Instead of the normal lub-dub heart sound, she heard a sloshy wobble in place of the lub. The heart sounds are made by the snapping shut of the heart valves. Which of Uncle Ben's valves might have been leaking? Is that sloshy sound heard during atrial or ventricular systole? Is the dub sound heard during atrial or ventricular diastole? 7.The cardiologist jokingly blamed Aunt May for Ben's heart murmur because she "tugged at his heart strings." How did his heart strings-or chordae tendinae actually support his atrioventricular valves? 7.This time, Aunt May needed quintuple bypass surgery. How does this procedure differ from open-heart valve surgery and from implantation of an artificial pacemaker? Explain the differences between the conditions that these procedures correct. 8.Explain how an angioplasty and the implantation of a stent can also serve as good treatment options for some heart attacks. Integrative Challenge Question 9.Which steps could someone like Peter's boss, J. J. Jameson, take to lower his risk of heart attack?

Human Anatomy & Physiology (11th Edition)

11th Edition

ISBN:9780134580999

Author:Elaine N. Marieb, Katja N. Hoehn

Publisher:Elaine N. Marieb, Katja N. Hoehn

Chapter1: The Human Body: An Orientation

Section: Chapter Questions

Problem 1RQ: The correct sequence of levels forming the structural hierarchy is A. (a) organ, organ system,...

See similar textbooks

Related questions

Question

4. Why are coronary arteries so easily blocked by floating embolisms? 5.One of the first diagnostic tools used at the hospital was an electrocardiogram (EKG or ECG), which reflects the electrical activity of the cardiac muscle. We know that the atrial contract first (the P wave) and then, after a brief delay, the ventricles contract (the QRS complex). Given that the heart does not have any nerves to stimulate the cardiac muscle cells, how is the timing of contraction coordinated? 6.Before his untimely death, Peter's Uncle Ben was diagnosed with a heart murmur. His primary care physician caught it during a routine checkup. Instead of the normal lub-dub heart sound, she heard a sloshy wobble in place of the lub. The heart sounds are made by the snapping shut of the heart valves. Which of Uncle Ben's valves might have been leaking? Is that sloshy sound heard during atrial or ventricular systole? Is the dub sound heard during atrial or ventricular diastole? 7.The cardiologist jokingly blamed Aunt May for Ben's heart murmur because she "tugged at his heart strings." How did his heart strings-or chordae tendinae actually support his atrioventricular valves? 7.This time, Aunt May needed quintuple bypass surgery. How does this procedure differ from open-heart valve surgery and from implantation of an artificial pacemaker? Explain the differences between the conditions that these procedures correct. 8.Explain how an angioplasty and the implantation of a stent can also serve as good treatment options for some heart attacks. Integrative Challenge Question 9.Which steps could someone like Peter's boss, J. J. Jameson, take to lower his risk of heart attack?