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Ch. 28 Pregnancy and Human Development
Hoehn - Marieb Human Anatomy & Physiology, 12th edition
Hoehn, Haynes, Abbott12th EditionMarieb Human Anatomy & PhysiologyISBN: 9780138242732Non è quello che usi tu?Cambia libro di testo
Capitolo 28, Problema 10

The initial stage of labor, during which the neck of the uterus is stretched, is the
(a) dilation stage
(b) expulsion stage
(c) placental stage

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Understand the stages of labor: Labor is typically divided into three main stages—dilation, expulsion, and placental stages.
The dilation stage is the first stage of labor, during which the cervix (neck of the uterus) gradually stretches and opens to allow the baby to pass through.
The expulsion stage is the second stage, where the baby moves through the birth canal and is delivered.
The placental stage is the third and final stage, involving the delivery of the placenta after the baby is born.
Since the problem asks for the stage during which the neck of the uterus is stretched, identify that this corresponds to the dilation stage.

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Stages of Labor

Labor is divided into three main stages: the dilation stage, the expulsion stage, and the placental stage. Each stage involves specific physiological changes and processes that prepare the body for childbirth.
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Dilation Stage

The dilation stage is the first phase of labor, characterized by the gradual opening and thinning of the cervix (neck of the uterus) to allow the baby to pass through the birth canal. This stage ends when the cervix is fully dilated to about 10 centimeters.
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Expulsion and Placental Stages

The expulsion stage follows dilation and involves the delivery of the baby through the birth canal. The placental stage is the final phase, during which the placenta is expelled from the uterus after the baby is born.
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