Ach Secreted from the Synapses of the Parasympathetic Nerve Endings

question 55

Multiple Choice

Ach secreted from the synapses of the parasympathetic nerve endings in the heart causes

• A) an increase of the duration of the action potential in SA node
• B) lower amplitude of action potential in SA node
• C) hyperpolarization of cells in SA node
• D) conduction to speed up between atria and ventricles

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