Action potentials in the ventricular cardiomyocytes differ from those in the SA node in that action potentials in the ventricular myocardiocytes __________.   A involve voltage-gated Ca+2 channels whereas those in the SA node do not   B occur less frequently; only every other action potential in the SA node causes an action potential in the contractile cells.   C begin at a less negative baseline because the SA node cells have more K+ channels   D have an initial spike due to fast voltage-gated Na+ channels

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A:

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A:

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Ecological Interactions

The study of the ecological interactions between living beings and their physical environment, including humans, is ecology. It aims to understand the crucial links between plants and animals and the world around them. Ecology also gives knowledge on the advantages of ecosystems and how we may use Earth resources to ensure that future generations have a healthy environment.