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Physiology of Labor

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Of the four phases of parturition, phase 2 is characterized by which of the following?

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a. Uterine activation, cervical ripening

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b. Uterine quiescence, cervical softening

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c. Uterine involution, cervical remodeling

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d. Uterine contraction, cervical dilatation

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Which phase of parturition corresponds to the clinical stages of labor?

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a. Phase 1

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b. Phase 2

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c. Phase 3

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d. Phase 4

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During which of the stages of labor is the fetus delivered?

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a. Stage 1

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b. Stage 2

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c. Stage 3

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d. Stage 4

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All EXCEPT which of the following cervical functions and cervical events take place during phase 1 of parturition?

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a. Maintenance of cervical competence despite growing uterine weight

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b. Maintenance of barrier between uterine contents and vaginal bacteria

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c. Alterations in extracellular matrix to gradually increase cervical tissue compliance

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d. Alteration of cervical collagen to stiffen the cervix

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Cervical softening in phase 1 of parturition results in part from which of the following?

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a. Stromal atrophy

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b. Increased stromal vascularity

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c. Increased collagen monomer cross-linking

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d. All of the above

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Contraction-associated proteins (CAPs) within uterine smooth muscle prepare it to contract during labor. CAP concentrations increase during phase 2 of parturition and include all EXCEPT which of the following proteins?

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a. Connexin 43

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b. Oxytocin receptor

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c. Progesterone receptor A

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d. Prostaglandin F receptor

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