Hunt 243 Lecture 3

Ovulation refers to:

• Implantation of the blastocyst

• Release of a mature egg from the ovary

• Fertilisation of the egg by sperm

• Shedding of the uterine lining

Fertilisation typically occurs in the:

• Ovary

• Uterus

• Fallopian tube

• Cervix

A zygote has:

• 23 chromosomes total

• 23 chromosomes from mother, 23 from father

• 46 chromosomes from mother only

• 92 chromosomes total

Cell division of the zygote results in:

• Ovum

• Blastocyst

• Embryo immediately

• Placenta

Successful implantation requires:

• Strong uterine contractions

• Blastocyst adhering to uterine lining

• Fully formed placenta

• Release of oxytocin

Which hormone confirms pregnancy in a test?

• Progesterone

• Oestrogen

• Human chorionic gonadotropin (hCG)

• Prolactin

Approximate length of pregnancy:

• 32 weeks

• 36 weeks

• 38 weeks from conception, ~40 weeks from LMP

• 42 weeks from conception

The amnion forms around:

• 1 day post-conception

• 2 weeks post-conception

• 8 weeks post-conception

• At delivery

Amniotic fluid functions include:

• Temperature regulation, cushioning, infection protection

• Fetal oxygen delivery

• Hormone secretion

• Blood supply to fetus

Teratogens are:

• Nutrients essential for fetal growth

• Agents causing congenital malformations

• Placental hormones

• Genetic mutations