Multiple choice

Factors that decrease the rhythmicity of the heart are known as negative chronotropic. Among the following, select a negative chronotropic.

  1. Vagal stimulation

  2. Mild alkalemia

  3. Sympathetic stimulation

  4. Moderate warming

  5. Thyroid hormones

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A Correct answer
Explanation

The basal level of vagal stimulation inhibits the sinus rhythm and decreases it from 110 to 75 beats/minute.