Which of the following is not true concerning the autonomic nervous system?

Options

A. Sympathetic responses include fight-or-flight responses
B. Sympathetic responses are generally widespread throughout the body
C. It includes sensory pre- and postganglionic fibres
D. Autonomic division is entirely motor

Explanation

To determine which statement is not true concerning the autonomic nervous system (ANS), we need to analyze each option provided in the question. The ANS is a part of the peripheral nervous system that controls involuntary bodily functions and is divided into the sympathetic and parasympathetic nervous systems.

### Step-by-Step Solution:

1. **Understand the Autonomic Nervous System (ANS)**:
- The ANS is responsible for regulating involuntary physiological functions, including heart rate, blood pressure, respiration, digestion, and sexual arousal. It operates automatically without conscious control.

2. **Analyze the Options**:
- **Option 1**: "Sympathetic response includes fight and flight response."
- This statement is true. The sympathetic nervous system is activated in stressful situations, preparing the body for a 'fight or flight' response.

- **Option 2**: "Sympathetic responses are generally widespread throughout the body."
- This statement is also true. The sympathetic nervous system affects multiple organs and systems simultaneously during a stress response.

- **Option 3**: "It includes sensory pre and postganglionic fibers."
- This statement is false. The ANS primarily consists of motor fibers (preganglionic and postganglionic) that control involuntary actions. It does not include sensory fibers as part of its structure.

- **Option 4**: "Autonomic division is entirely motor."
- This statement is true. The ANS is primarily motor in function, controlling involuntary actions without sensory input.

3. **Identify the Incorrect Statement**:
- The statement that is not true concerning the autonomic nervous system is **Option 3**: "It includes sensory pre and postganglionic fibers."

4. **Conclusion**:
- The correct answer to the question is that the ANS does not include sensory pre and postganglionic fibers.