Smooth muscle as a contractile unit.
D005260:Female; D006801:Humans; D009119:Muscle Contraction; D009130:Muscle, Smooth; D009132:Muscles / Q000502:physiology*; D011374:Progesterone / Q000494:pharmacology*; D014599:Uterus / Q000502:physiology*
D011374:Progesterone
MUSCLES/physiology; PROGESTERONE/pharmacology; UTERUS/physiology