What location best represents a trough of low pressure? 
Definitions:
Contractions
The tightening and releasing of the muscles of the uterus during childbirth or to indicate the onset of labor.
Anesthetics
Anesthetics are substances used to induce anesthesia, a state of temporary loss of sensation or awareness, typically used during surgical procedures.
Childbirth
The process of giving birth to a baby, including labor and delivery.
Placental Membrane
A thin tissue layer in the placenta that separates the mother's blood from the fetus's blood, allowing exchange of materials but not direct blood mixing.
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