Factor causing clot retraction is released by

Options

A. liver
B. traumatised tissues
C. thrombocytes
D. mast cells

Answer

To answer the question "Factor causing clot retraction is released by," we will break down the information step by step.

### Step-by-Step Solution:

1. **Understanding Clot Retraction**: Clot retraction is a process that occurs after a blood clot has formed. It helps in stabilizing the clot and reducing the size of the clot, which is important for wound healing.

2. **Role of Platelets**: The primary cells involved in the clotting process are platelets, also known as thrombocytes. When a blood vessel is injured, platelets aggregate at the site of injury and form a temporary plug.

3. **Substances Released by Platelets**: Upon activation, platelets release various substances that facilitate the coagulation process. These substances include clotting factors and proteins that help in the contraction of the clot.

4. **Identifying the Source of Clot Retraction Factors**: The specific factor that is responsible for clot retraction is released by platelets. This factor is known as platelet-derived growth factor (PDGF) and other contractile proteins that help in the retraction process.

5. **Conclusion**: Therefore, the factor causing clot retraction is released by platelets (thrombocytes).

### Final Answer:
The factor causing clot retraction is released by **thrombocytes (platelets)**.

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