States) N P 21. Name the effect of the following factors on heart rate: Norepinephrine (hormone or neurotransmitter) Epinephrine (hormone) Acetylcholine (neurotransmitter) Low O2 levels Ca*2 channel blocker medication Factor Channel 22. State the channels involved during an action potential in cardiac CONTRACTILE cells and then describe in which direction each ion moves across the channel when the channel fully opens. I lon? Influx or Efflux? 1. 2. 3. 4. Increases or Decreases Heart Rate? 23. Be able to draw an action potential in a cardiac CONTRACTILE cell. Include the SEP 9 O Focus

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