Figure 5. Representative electromyograph uterine activity over time in response to oxytocin administration.

Representative electromyograph (EMG) activity over time (min) recorded in vivo from the uterine smooth muscle of sheep (n=8). (A) spontaneous activity during parturition and prior to oxytocin administration; (B) activity following pulmonary administration of 200 IU (nominal dose) of oxytocin prepared as an ultrafine spray-dried powder and; (C) activity following IM injection of 10 IU of oxytocin solution. Oxytocin dose and time of administration are indicated (OT = oxytocin).