21 - Chapter 27 Reproduction and Embryonic Development Exam...

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Chapter 27 Reproduction and Embryonic Development Exam Wednesday March 26 On Chapter 26,27 homework assignment due Tuesday 10 am 27.17 Timeframe of gestation- divided into three trimester 27.18 - Dilation of the cervix o 10 cm-head and shoulders of infant can fit o bone plates of infant skull have not fused-pointy head - Expulsion o Delivery of the infant o Delivery of the placenta (afterbirth) - What starts labor? o Amniotic sac breqks, baby is under stress, hormones, etc… - What controls labor? Hormones… 27.18 - Childbirth- a series of contractions of the uterus (smooth muscle tissue) that become stronger and more frequent. How? - Estrogen o Origin? Maternal Ovaries o Targets? Uterus o Results? Turns on genes to make protein to bind oxytocin (oxytocin receptor) - Oxytocin o Origin? (2) Fetus/Maternal Hypothalamus -> postular pituitary o Targets? (2) Uterus (fetus makes oxytocin) o Results? (2 or 3) uterus contracts, stimulates placenta to make prostaglandins - Prostaglandins o Origin? Placenta
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21 - Chapter 27 Reproduction and Embryonic Development Exam...

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