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Thread: PSy

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    Asclepius1's Avatar
    Asclepius1 is offline Ultimate Member 537 points
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    PSy

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    And now, a question for thinking .Why isn't parasympathetic stimulation on heart so strong? And why is its negative hronotropic effect so strong and important?

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    I see that I have to answer to myself.Just think of parasympathetic receptors, where are they located? They are mostly in atrial musle, SA and AV node! Recall that vagus nerve doesn't control ventricles! That is why vagus nerve doesn't have so strong influence on heart inotropy. But, vagus has strong effect on heart rate because it inervates SA and AV node!

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