Birth and Parturition
Biology ⇒ Reproduction and Development
Birth and Parturition starts at 9 and continues till grade 12.
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Describe the changes in hormone levels (estrogen and progesterone) that occur just before labor.
Describe the changes that occur in the cervix during the first stage of labor.
Describe the function of the placenta during birth.
Describe the physiological changes that occur in the uterus during labor.
Describe the role of prostaglandins in parturition.
Describe the role of relaxin during birth.
Explain the importance of the positive feedback loop involving oxytocin during labor.
Explain the positive feedback mechanism involved in parturition.
The first stage of labor is characterized by: (1) Delivery of the baby (2) Dilation of the cervix (3) Expulsion of the placenta (4) Rupture of the amniotic sac
Which fetal hormone is believed to help initiate labor by increasing estrogen production? (1) Fetal cortisol (2) Fetal insulin (3) Fetal thyroxine (4) Fetal adrenaline
Which hormone is primarily responsible for initiating uterine contractions during parturition? (1) Progesterone (2) Estrogen (3) Oxytocin (4) Prolactin
Which hormone is responsible for the increase in uterine sensitivity to oxytocin near term? (1) Estrogen (2) Progesterone (3) Prolactin (4) Human chorionic gonadotropin
Fill in the blank: The expulsion of the fetus from the uterus is called __________.
Fill in the blank: The hormone __________ is released from the posterior pituitary and stimulates uterine contractions.
Fill in the blank: The hormone __________ is released in response to cervical stretching and enhances uterine contractions.
Fill in the blank: The hormone __________ is responsible for milk ejection after birth.
True or False: Prostaglandins play a role in softening the cervix and enhancing uterine contractions during labor.
True or False: The cervix must be fully dilated to approximately 10 cm before the baby can be delivered vaginally.
True or False: The expulsion stage of labor ends with the delivery of the placenta.
True or False: The hormone oxytocin is only produced by the mother during labor.
