What are blood platelets ? Give their function.

Explanation

### Step-by-Step Solution:

1. **Definition of Blood Platelets**:
Blood platelets, also known as thrombocytes, are small, disc-shaped cell fragments found in the blood. They are not complete cells but rather cytoplasmic fragments derived from larger cells called megakaryocytes in the bone marrow.

2. **Size and Structure**:
Platelets are very small in size compared to other blood cells. They lack a nucleus and are primarily composed of cytoplasm and cell membrane.

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