<prompt> Following injury to blood vessels , immediate haemostasis is achieved by which of the followingFibrin depositionVasoconstrictionPlatelets adhesionThrombosis  <response>: ref Robbins 8e p115 Vascular spasm Vasoconstriction -Vasoconstriction is produced by vascular smooth muscle cells, and is the blood vessels first response to injury. ... When a blood vessel is damaged, there is an immediate reflex, initiated by local sympathetic pain receptors, which helps promote vasoconstriction 