Multiple choice

Which among the following statements regarding the innervation of the human heart is FALSE?

  1. Preganglionic sympathetic fibres ascend from the upper five thoracic segments of the spinal cord.

  2. The effect of autonomic nervous system on coronary artery and blood flow is reciprocatory.

  3. Postganglionic fibres descend to the heart and form two plexuses.

  4. During rest, the vagal tone is recessive.

  5. Afferent fibres carrying pain sensation run to the spinal cord.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

During rest, the vagal tone is the dominant. There is continuous parasympathetic activity that has a negative chronotropic character.

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