South Texas CollegeRNSG 1300Test 1 OB question and answer

Question 1 The nurse explains to the patient that the obstetric conjugate measurement is important because: 1. This measurement determines the tilt of the pelvis. 2. This measurement determines the shape of the inlet. 3. The fetus passes under it during birth. 4. The size of this diameter determines whether the fetus can move down into the birth canal so that engagement can occur. Correct Answer: 4 Rationale 1: A change in the lumbar curve can increase or decrease the tilt of the pelvis. Rationale 2: The transverse diameter is the largest diameter of the inlet, and it helps determine its shape. Rationale 3: The fetus passes under the pubic arch, which is part of the pelvic outlet. Rationale 4: The obstetric conjugate extends from the middle of the sacral promontory to an area approximately 1 cm below the pubic crest. The fetus passes through the obstetric conjugate, and the size of this diameter determines whether the fetus can move down into the birth canal in order for engagement to occur. Question 2 A prenatal patient asks the nurse how the baby can possibly come out through her vagina, because a vagina is not nearly as big as a baby. How does the nurse best answer this patient's question? “The vagina: 1. “Usually tears as it