Question

which of the following best describes the function of the sympathetic nervous system? a. it creates equilibrium in the body. b. it arouses the body and expends energy. c. it raises the energy level of the body. d. it calms the body and conserves energy. please select the best answer from the choices provided
a
b
c
d

Explanation:

To determine the function of the sympathetic nervous system:

• Option A: The parasympathetic and sympathetic systems together help maintain homeostasis (equilibrium), but the sympathetic system alone doesn't "create" equilibrium. So A is incorrect.
• Option B: The sympathetic nervous system is part of the "fight - or - flight" response. It arouses the body (e.g., increases heart rate, dilates pupils) and expends energy to prepare the body for action. This is a core function of the sympathetic nervous system.
• Option C: While the sympathetic system can increase energy availability, the description "raises the energy level" is too simplistic. Its main role is more about arousing the body for action (which involves expending energy), so C is not as accurate as B.
• Option D: The parasympathetic nervous system is responsible for calming the body and conserving energy (the "rest - and - digest" response), not the sympathetic system. So D is incorrect.

Answer:

B. It arouses the body and expends energy.