By the time a cardiac muscle cell membrane repolarizes and i…
By the time a cardiac muscle cell membrane repolarizes and is capable of generating a second action potential the cell will have completed its cycle of contraction and has begun relaxing. This means that cardiac muscle cells:
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Bonus (1 point will be added for a correct answer): Use the graph of Age vs Target Heart Rate (above) to determine how old you will be when your Maximum Target HR (100%) will be equal to your 75% Target Heart rate from when you were 20 years old. Type the numerical age in the box below.
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