Pathology A mechanic working on a car accidently cut his finger and begins to bleed. Which endogenous molecule will initiate the process of hemostasis? A Calcium B Thromboxane A2 C Nitrous oxide D Endothelium 💡 Explanation A mechanic working on a car accidently cut his finger and begins to bleed. Which endogenous molecule will initiate the process of hemostasis? ✓ Correct Answer: D. Endothelium