22 Questions
What type of transport is required for amino acids and iron to cross the placenta?
Active transport
During which weeks does the placenta take over the endocrine function from the corpus luteum?
Weeks 12-17
What is the function of relaxin during pregnancy?
To loosen the pelvis and dilate the cervix
What is the name of the plug of mucus that is expelled from the cervix about 2 days before labor?
Bloody show
What is the primary function of estrogen during pregnancy?
To stop ovulation and stimulate maternal tissue growth
What is the name of the stage of childbirth where the fetus is expelled from the birth canal?
Expulsion stage
What is the primary function of the foramen ovale and ductus arterioles in a newborn?
To direct blood flow from the right atrium to the left atrium
What is the significance of colostrum in lactation?
It is rich in immunoglobulins and provides passive immunity
What is the term for an individual who carries a recessive allele and can pass it on to their offspring?
Carrier
What is the process by which the uterus returns to its pre-pregnancy size after birth?
Involution
What triggers the production of breast milk in lactation?
Infant sucking at the nipple
What determines an individual's sex?
Sex chromosomes (XX or XY)
What is the primary function of the corona radiata and zona pellucida?
To prevent the sperm from penetrating the oocyte
What is the fate of the sperm that do not penetrate the corona radiata and zona pellucida?
They are destroyed by phagocytic leukocytes
What is the term for the process by which the sperm releases enzymes to penetrate the corona radiata and zona pellucida?
Acrosomal reaction
What is the approximate percentage of blastocysts that fail to implant in the uterine wall?
50-75%
What is the term for the fluid-filled sac that surrounds the embryo and provides protection?
Amnion
What is the purpose of the primitive streak in embryogenesis?
To differentiate the embryo into endoderm, mesoderm, and ectoderm
What is the term for the development of the placenta from embryonic and maternal tissues?
Placentation
What is the approximate time period during which the placenta develops?
Weeks 4-12
What is the term for the process by which the embryo becomes cylindrical in shape due to embryonic folding?
Embryonic folding
What is the term for the formation of identical twins, resulting from the splitting of a single zygote?
Identical twins
Learn about the process of fertilization, where a sperm and an oocyte combine to form a zygote, and how the sperm navigate through the reproductive system to reach the egg. Discover the obstacles that sperm face and how they are eliminated during this process.
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