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The external cervical os in a nonporous female is typically _________________________.
Closed
Open
Inverted
Obstructed
The correct answer is: Closed
In a nonporous female, the external cervical os is typically closed. The external os is the opening of the cervix that connects the cervical canal to the vagina. In nonporous females, which are often associated with being in a pre-menopausal state or not having given birth, the cervical mucus tends to be thicker and the os remains more closed. This closure helps maintain a barrier against contaminants and pathogens, contributing to reproductive health. In contrast, during certain physiological states, such as ovulation or after childbirth, the external cervical os may open or become more pliable. Additionally, conditions such as infections or certain reproductive health issues can cause variations in the openness of the cervical os. Therefore, the state of being closed is characteristic for nonporous females, reflecting normal reproductive physiology in this context.