When the male sperm enters the body and fertilizes the egg within the woman.
:P
To put it simply, humans are a monkey see, monkey do kind of animal most of the tme. therefore, if we have a role model, we simply take after them. we look up to them and try to imitate.
False. The oxygenation and pumping of the heart depends on physical exertion as well as emotions.
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.