Question

autonomic tone is important because it
provides for a narrow range of control options that keeps target tissues constantly active.
allows ans neurons to increase or decrease their activity.
allows ans neurons to be silent under normal conditions.
allows ans neurons to decrease their activity on demand but not increase their activity.
allows ans neurons to increase activity on demand but not decrease their activity.

Explanation:

Autonomic tone refers to the balance between sympathetic and parasympathetic activity. It allows the autonomic nervous system (ANS) neurons to adjust their activity. For example, when needed, the sympathetic division can increase activity (e.g., during fight - or - flight), and the parasympathetic division can decrease activity (e.g., during rest - and - digest). This balance is crucial for maintaining homeostasis. The other options are incorrect:

• A narrow range of control options is not correct as the ANS has a wide range of functions.
• ANS neurons are not silent under normal conditions as there is a constant tone.
• It's not just about decreasing or just about increasing activity on demand; it's a two - way regulation.

Answer:

allows ANS neurons to increase or decrease their activity.