What is the function of Tropomyosin?

Explanation

### Step-by-Step Text Solution:

1. **Definition of Tropomyosin**: Tropomyosin is a protein found in muscle cells that plays a crucial role in muscle contraction.

2. **Blocking Myosin Binding Sites**: The primary function of tropomyosin is to block the myosin binding sites on actin molecules. This means that when tropomyosin is present, it prevents myosin heads from attaching to actin filaments.

3. **Prevention of Cross Bridge Formation**: By blocking the myosin binding sites, tropomyosin prevents the formation of cross bridges between actin and myosin. Cross bridges are essential for muscle contraction, as they are formed when myosin heads attach to actin.

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