What is blood coagulation ? Give its significance.

Explanation

### Step-by-Step Solution

**Step 1: Definition of Blood Coagulation**
Blood coagulation is the process by which blood changes from a liquid state to a gel-like state, forming a clot. This process occurs at the site of injury to prevent excessive bleeding.

**Step 2: Mechanism of Blood Coagulation**
The coagulation process involves several key components:
- **Platelets**: These are small cell fragments that play a crucial role in blood clotting. When an injury occurs, platelets aggregate at the site and release substances that initiate the coagulation cascade.
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