442 UNIT 21 | Anatomy of the Heart 3. The fetal structure shunts blood from the

Question

442 UNIT 21 | Anatomy of the Heart 3. The fetal structure shunts blood from the pulmonary trunk to the aorta. Its adult remnant is the 4. Are all cardiac muscle fibers contractile? Explain. What is a myocardial infarction? Why is the anterior interventricular artery called the "widow maker"? 5. B. Concept Mapping 1. Fill in the blanks to complete this concept map outlining heart anatomy endogárdium interventrpícular septum visceral pericardium HEART 3 layers of heart wall 4 heart chambers Epicardiumm Myocardium tu Also known as 2 pumping chambers 2 receiving chambers Separated by 2. 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. aorta atrioventricular valve atrium auricle chordae tendineae

Explanation / Answer

Answer 3) ductus arteriosus shunts the blood. Its adult remnant is known as ligamentum arteriosum.

Answer 4) yes. Each myocardial cell contains myofibrils, which are specialized organelles consisting of long chains of sarcomeres, the fundamental contractile units of muscle cells.

Answer 5) myocardial infarction is a disease condition in which there occurs lack of oxygen due to decreased blood supply or no blood supply to any one part of heart resulting in damage to that part of heart. It is also known as heart attack.

The anterior interventricular artery is called the Widowmaker because it supplies to a large part of heart. Occlusion (block) of this artery will result in less blood supply to heart resulting in myocardial infarction which will lead to sudden death.

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