Week4 0.0 / 5 ? BiologyGeneticsUniversityNone Created by: ElizaLawsonCreated on: 28-10-18 23:51 The sympathetic nervous system increases heart rate by: opening T-type Ca2+ channels and opening funny channels 1 of 7 After reaching the AV node, the depolarizing current in the heart travels to the: Bundle of His 2 of 7 In cardiac muscle, action potentials spread through the cells because of electrical coupling through: gap junctions 3 of 7 In an ECG recording, the RR interval is 0.5 seconds. What is the heart rate? 120 beats/min 4 of 7 The parasympathetic nervous system decreases heart rate by: opening K+ channels and closing T-type Ca2+ channels 5 of 7 How many leads are used for a full ECG? 12 6 of 7 During contraction of heart muscle cells: some calcium enters the cell from the extracellular space and triggers the release of larger amounts of calcium from intracellular stores 7 of 7
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