Question

If the connection between the vagus nerve and the heart is cut, which of these changes will occur?

The heart will beat faster.
Stroke volume will decrease.
Heart will beat slower.
Cardiac output will decrease.
Nodal fibers will depolarize more slowly.

Answer 1

If the connection between the vagus nerve and the heart is cut, the heart will beat faster. This is because the vagus nerve, which is part of the parasympathetic nervous system, normally acts to slow down the heart rate. When the vagus nerve is cut, this inhibitory effect is removed, resulting in an increase in heart rate. Therefore, the correct answer is: The heart will beat faster.

The stroke volume, cardiac output, and nodal fibers are not directly affected by the vagus nerve, so they would not be expected to change significantly in this scenario.

Step-by-step explanation: