A student of standard IX gave the functions of the following cells/tissues wrongly. Correct these answers:
Nerve cells: Contract and relax to cause movement.

Explanation

### Step-by-Step Solution:

1. **Identify the Incorrect Function**: The student stated that nerve cells "contract and relax to cause movement." This is incorrect as it describes the function of muscle cells, not nerve cells.

2. **Understand the Correct Function of Nerve Cells**: Nerve cells, also known as neurons, are specialized cells that transmit information throughout the body. Their primary function is to carry messages in the form of electrical impulses.

3. **Explain the Role of Nerve Cells**: Nerve cells communicate signals from the brain to different parts of the body and vice versa. They are essential for coordinating actions and responses to stimuli.

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