Name: _________________________________________ Section: _____________________ Date: _____________Activity No. ________Heart Contraction and Transport of Materials I. Terms:AV node SA node parts of the heart precapillary sphincterBundle of His Purkinje Fibers cardiac cycle systolediastole cardiac output stroke volume law of continuityp wave qrs complex t wave II. Heart ContractionIdentify the parts labelled 1, 2, 3 and 4. What will happen to the heart if 1 is destroyed? What will happen to the heart if 2is destroyed? What will happen to the heart if 3is destroyed? What will happen to the heart if left bundle of 4 is destroyed?If right bundle of 4 is destroyed? III. What are the effects of the following factors to blood pressure? (increase, decrease, no effect) Stroke volume- cardiac output- heart rate- Exercise- hormones- coffee- IV. Explain what happens in each section identified in the diagram below.