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Final answer:The first response in the hemostatic process in vivo is vascular spasm.Explanation:The first response in the hemostatic process in vivo is vascular spasm. Hemostasis is the process by which the body stops bleeding and forms a blood clot.When a blood vessel is damaged, the smooth muscles in the vessel wall contract, causing vasoconstriction and reducing blood flow. This initial response helps to minimize blood loss....