Birth and Parturition
Biology ⇒ Reproduction and Development
Birth and Parturition starts at 9 and continues till grade 12.
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Describe the role of the cervix during childbirth.
Describe what happens during the dilation stage of labor.
Describe what happens to the uterus after the placenta is expelled.
During which stage of labor does the cervix open fully?
Explain the importance of the positive feedback mechanism in labor.
Explain why contractions become stronger and more frequent as labor progresses.
Explain why the placenta must be expelled after the baby is born.
A woman in labor is experiencing strong, regular contractions, but the cervix is not dilating as expected. Suggest two possible reasons for this and explain your reasoning.
Which hormone decreases just before labor begins, allowing uterine contractions to start?
(1) Estrogen
(2) Progesterone
(3) Oxytocin
(4) Prolactin
Which hormone increases uterine contractions during labor?
(1) Progesterone
(2) Estrogen
(3) Oxytocin
(4) Insulin
Which hormone is responsible for milk ejection after birth?
(1) Prolactin
(2) Oxytocin
(3) Estrogen
(4) Progesterone
Which of the following best describes the placental stage of labor?
(1) The baby is delivered
(2) The cervix dilates
(3) The placenta is expelled
(4) The amniotic sac ruptures
Fill in the blank: The ________ is the organ that nourishes the fetus during pregnancy and is expelled after birth.
Fill in the blank: The ________ stage of labor involves the actual delivery of the baby.
Fill in the blank: The hormone ________ helps to relax the pelvic ligaments during childbirth.
Fill in the blank: The hormone ________ is released in response to the stretching of the cervix during labor.
True or False: The amniotic sac usually ruptures before the expulsion stage of labor.
True or False: The baby's head usually comes out first during a normal delivery.
True or False: The cervix must dilate to about 10 centimeters for the baby to pass through during birth.
True or False: The expulsion stage is the shortest stage of labor.
