four stages of anesthesia

stage 1
stage of analgesia. begins with the administration of the anesthetic agent and ends when the patient becomes unconsious. hearing is amplified at the end of this stage

stage 2
the excitment phase. muscles become tense but swallowing and vomiting reflexes are still present. breathing may become illregular or the breath may be held. The enviorment must be quiet during this period

stage 3
Surgical anesthesia state. Begins with oneset of regular breathing again. Vital functions are depressed, eyes are fixed. and reflexes are lost or temporaily depressed