Which of the following is NOT a typical effect of the sympathetic nervous system activation?

The correct answer highlights a fundamental aspect of sympathetic nervous system activation. When the sympathetic nervous system is activated, it triggers the "fight or flight" response, which generally prepares the body for action. This response typically includes an increased heart rate to supply more oxygen and nutrients to the muscles, enabling a quick reaction to stressors. Therefore, a decreased heart rate is not a typical effect of sympathetic activation; it contrasts with what is expected.

The other effects mentioned are characteristic of sympathetic activation. For instance, increased blood flow to muscles supports better performance during physical exertion. An increased respiratory rate enhances oxygen intake, which is crucial during heightened activity. Additionally, the release of glucose into the bloodstream provides immediate energy for the body's increased demands. Each of these responses is designed to optimize physical performance and reaction to stress, while a decreased heart rate does not align with these survival-enhancing effects.