The brain is the main part of the nervous system. Which of the following functions. is not performed directly by the brain?

Options

A. Digestion of food
B. Pumping the blood
C. Controlling movement
D. Secretion of hormones

Answer

To determine which function is not performed directly by the brain, we need to analyze the functions typically attributed to the brain and those that are not.

### Step-by-Step Solution:

1. **Understand the Role of the Brain**: The brain is a crucial part of the central nervous system (CNS) and is responsible for processing information, controlling voluntary and involuntary movements, and regulating various bodily functions.

2. **Identify the Functions of the Brain**: The brain is involved in:
- Processing sensory information (vision, hearing, etc.)
- Controlling voluntary movements (like walking)
- Regulating involuntary functions (like breathing and heart rate)
- Managing emotions, thoughts, and memory.

3. **Consider the Options Given**: Without the specific options listed in the question, we can still analyze common functions that might be included:
- Digestion of food
- Pumping of blood
- Hormonal control
- Sensory processing

4. **Analyze Each Function**:
- **Digestion of Food**: While the brain regulates digestion through the autonomic nervous system, the actual process of digestion occurs in the digestive organs.
- **Pumping of Blood**: This function is primarily performed by the heart, which is not controlled directly by the brain. The brain does influence heart rate through the autonomic nervous system, but it does not pump blood itself.
- **Hormonal Control**: The brain, particularly the hypothalamus, plays a significant role in hormone regulation.
- **Sensory Processing**: This is a direct function of the brain, as it processes sensory information.

5. **Conclusion**: Based on the analysis, the function that is not performed directly by the brain is the **pumping of blood**, as this is the primary function of the heart.

### Final Answer:
The function that is not performed directly by the brain is **pumping of blood**.