Answer: Myometrium which consist of uterine smooth muscle cells and other supporting tissues
Step-by-step explanation:
Myometrium is the middle layer found in uterine wall that induces contractions during labour. It is an excitable tissue that initiates contraction through an action-potential brought by membrane depolarization in the uterus. This is so that child birth does not have to be a voluntary action, rather a response to hormones such as oxytocin.