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Cardiovascular 2 Supplemental Instruction Iowa State University SI Session Leader: Course: Instructor: Date: Chelsea P AnS 214 Dr. Selsby 2/26/17 1. Label the parts of the heart. 2. A heartbeat originates with the depolarization of __________________________ cells at the ___________________________ also called the _______________________. The electrical signal is transmitted to the ____________________________ which connects the ____________________ and ________________________. The electrical signal continues through the AV bundle also called the _______________________________ into the left and right ___________________ located in the septum. This carries the impulse towards the _____________ of the heart. Finally, the signal is conducted into _________________________________which will depolarize the _________________ fibers in the ventricles. 3. Describe the properties of an autorhythmic heart cell. 4. Label the diagram and explain what is happening at each stage. 1060 Hixson-Lied Student Success Center 515-294-6624 [email protected] http://www.si.iastate.edu 5. What causes the heart to have a long absolute refractory period? 6. Define each homeostatic imbalance. Arrhythmia Fibrillation Defective SA node Defective AV node 7. Label the three waves and describe what is taking place.