Involuntary muscles are innervated by :

Options

A. Motor nerves from brain
B. Sensory nerves from spinal cord
C. Both motor and sensory nerves from brain and spinal cord
D. Nerves from autonomic nervous system

Answer

**Step-by-Step Solution:**

1. **Understanding Involuntary Muscles**: Involuntary muscles are those muscles that are not under conscious control. They function automatically and are regulated by the autonomic nervous system. Examples include cardiac muscles (found in the heart) and smooth muscles (found in organs like the intestines and blood vessels).

2. **Analyzing the Options**:
- **Option 1: Motor nerves from the brain**: This option is incorrect because motor nerves from the brain are part of the somatic nervous system, which controls voluntary movements.
- **Option 2: Sensory nerves from the spinal cord**: This option is also incorrect as sensory nerves are responsible for transmitting sensory information to the central nervous system and do not innervate muscles.
- **Option 3: Both motor and sensory nerves from the brain and spinal cord**: This option is incorrect as it combines the previous two incorrect options.
- **Option 4: Nerves from the Autonomic Nervous System**: This option is correct. The autonomic nervous system innervates involuntary muscles, controlling functions without conscious effort.

3. **Conclusion**: The correct answer to the question "Involuntary muscles are innervated by:" is **Option 4: Nerves from the Autonomic Nervous System**.