Which of the following is true of the sympathetic nervous system?

• A. It primarily uses acetylcholine as its neurotransmitter.
• B. It prepares the body for 'fight or flight' responses.
• C. It is responsible for the 'rest and digest' response.
• D. It decreases heart rate and promotes digestion.

Answer: (B)

Verified step by step guidance

1. Understand the role of the sympathetic nervous system: It is part of the autonomic nervous system, which controls involuntary body functions.
2. Recognize the primary function of the sympathetic nervous system: It prepares the body for 'fight or flight' responses, which are reactions to stress or danger.
3. Identify the neurotransmitter used by the sympathetic nervous system: While acetylcholine is used at the ganglionic synapse, norepinephrine is primarily used at the target organ synapse.
4. Differentiate between sympathetic and parasympathetic nervous systems: The parasympathetic nervous system is responsible for 'rest and digest' responses, which are opposite to the sympathetic system's functions.
5. Consider physiological effects: The sympathetic nervous system increases heart rate and inhibits digestion, preparing the body for rapid action.