What happens to the bicep and tricep muscles when we bend our arm?

Explanation

### Step-by-Step Solution:

1. **Identify the Muscles**: In the human arm, there are two main muscles involved in bending the arm: the biceps and the triceps. The biceps are located on the front side of the upper arm, while the triceps are located on the back side.

2. **Bending the Arm**: When you bend your arm, the biceps muscle contracts. This contraction means that the muscle fibers shorten, which pulls the forearm up towards the shoulder.

3. **Effect on Biceps**: As the biceps contract and shorten, the arm becomes shorter, and the hand moves closer to the shoulder. This action allows you to lift or pull objects.

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