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Answer: A. Prothrombin is converted into thrombin which acts on fibrinogen.
Explanation:
Prothrombin is a protein which is converted into thrombin through a blood clotting factor that is known as factor X or prothrombinase.
Thrombin then transform the fibrinogen protein into fibrin threads. The fibrin thread acts like a wire mesh to trap the blood cells and forms a scab or clot. This entire process is called as coagulation.
The answer is 1014 because you have to divide
The right side of your heart receives oxygen-poor blood from your veins and pumps it to your lungs, where it picks up oxygen and gets rid of carbon dioxide. The left side of your heart receives oxygen-rich blood from your lungs and pumps it through your arteries to the rest of your body.