Cardiac activity could be moderated by the autonomous neutral system. Tick the correct answer

Options

A. The parasympathetic system stimulates hean rate and stroke volume
B. The sympathetic system stimulates heart rate and stroke volume
C. The parasympathetic system decreases the heart rate but increase stroke volume
D. The sympathetic system decreases the heart rate but increase stroke volume

Explanation

To solve the question regarding how cardiac activity is moderated by the autonomous neural system, we will analyze the options provided and determine which one is correct based on our understanding of the sympathetic and parasympathetic nervous systems.

### Step-by-Step Solution:

1. **Understand the Role of the Autonomic Nervous System**:
- The autonomic nervous system (ANS) consists of two main branches: the sympathetic and parasympathetic systems.
- The sympathetic system is generally responsible for the "fight or flight" response, which increases heart rate and cardiac output.
- The parasympathetic system is associated with the "rest and digest" response, which typically decreases heart rate.

2. **Analyze the Options**:
- **Option A**: "The parasympathetic system stimulates heart rate and stroke volume."
- This statement is incorrect because the parasympathetic system decreases heart rate.
- **Option B**: "The parasympathetic system stimulates heart rate and stroke volume."
- This statement is also incorrect for the same reason as Option A.
- **Option C**: "The parasympathetic system decreases the heart rate but increases the stroke volume."
- This statement is partially correct; the parasympathetic system does decrease heart rate but does not typically increase stroke volume.
- **Option D**: "The sympathetic system decreases the heart rate but increases the stroke volume."
- This statement is incorrect because the sympathetic system actually increases heart rate and stroke volume.

3. **Identify the Correct Answer**:
- Based on the analysis, none of the options accurately describe the functions of the sympathetic and parasympathetic systems. However, if we were to choose the best among the incorrect options, we would note that the sympathetic system is responsible for increasing heart rate and stroke volume, which is not explicitly stated in any of the options.

4. **Conclusion**:
- The correct understanding is that the sympathetic system increases both heart rate and stroke volume, while the parasympathetic system decreases heart rate. Therefore, if the question requires selecting the most accurate option based on the provided answers, we would conclude that none of the options are correct, but the sympathetic system is responsible for stimulating heart rate and stroke volume.

### Final Answer:
None of the options are entirely correct, but the sympathetic system is responsible for increasing heart rate and stroke volume.