3. Are all cardiac muscle fibers contractile? Explain. 4. What is a myocardial i

Question

3. Are all cardiac muscle fibers contractile? Explain. 4. What is a myocardial infarction? Why is the anterior interventricular artery called the widow-maker"? B. Concept Mapping Fill in the blanks to complete this concept map outlining heart anatomy. atria endocardium interventricular septum ventricles visceral pericardium HEART 3 kyers of heart wa 4 heart chambers Also knon as 2 pumping chambers 2 receaiving Construct a unit concept map to show the relationships among the following set of terms. Include all of the terms in your diagram. Your instructor may choose to assign additional terms. 2. aorta atrioventricular valve auricle chordae tendineae coronary sinus papillary muscle semilunar valve superior vena cava 454 UNIT 20 I Anatomy of the Heart

Explanation / Answer

3,Yes all cardiac muscle fibres contract via excitation contraction coupling by mechanism known as calcium induced calcium release during which electric stimulus called action potential is converted into a mechanical rsponse called muscle contraction.

4,Myocardial infarction or heart attack is the irreversible death (necrosis) of heart muscle secondary to prolonged lack of oxygen supply (ischemia).

The anterior interventricular artery is called widowmaker because it supply blood to large areas of the heart and if the artery is abruptly and completely occluded it will cause a massive heart attack that will lead to sudden death.

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