Question

autonomic motor neurons regulate activity of the heart (cardiac) by which of the following ways? a.) increase and decrease in cardiac activity b.) increase in cardiac activity c.) no effect on cardiac activity d.) decrease in cardiac activity

Explanation:

Autonomic motor neurons, which include both sympathetic and parasympathetic neurons, have opposing effects on the heart. Sympathetic neurons increase cardiac activity (e.g., heart rate, contractility) to prepare the body for "fight - or - flight" situations. Parasympathetic neurons (vagus nerve, for example) decrease cardiac activity to promote "rest - and - digest" functions. So, together they regulate cardiac activity by both increasing and decreasing it.

Answer:

A. Increase and decrease in cardiac activity