22 Questions
What is the result of the fusion of sperm and oocyte nuclei during fertilization?
A zygote
What percentage of sperm are killed due to acidity during fertilization?
Millions
What is the purpose of capacitation in sperm preparation for fertilization?
To thin the membrane over the head
What are the two layers that surround the oocyte?
Corona radiata and zona pellucida
What is the acrosomal reaction?
The release of enzymes by the sperm to penetrate the oocyte layers
What is the result of fertilization in terms of meiosis?
Meiosis is completed
What is the gestation time for full fetal development?
From fertilization to birth
What is the purpose of hCG release during implantation?
To keep the corpus luteum healthy and secreting progesterone
What is the function of the yolk sac during embryonic development?
To provide nourishment to the embryo until the placenta is functional
When is the placenta complete?
By the end of week 12
What happens to the foramen ovale and ductus arterioles after birth?
They close
What is the primary function of colostrum secreted in the first 72 hours after birth?
Passive immunity
What is the term for the allele that will show in a heterozygous individual?
Dominant
What is the result of the genotype XX or XY in an individual?
Determination of sex
What is the purpose of the hormone prolactin in lactation?
To establish and maintain milk supply
What is the term for an individual with a single X chromosome, resulting in undeveloped sexual organs?
Turner syndrome
During which weeks does the placenta take over the endocrine function from the corpus luteum?
Weeks 12-17
What is the primary function of relaxin during pregnancy?
To loosen the pelvis and dilate the cervix
During which weeks does the fetus begin to produce surfactant in the lungs?
Weeks 16-20
What is the average additional daily caloric intake required during the 2nd and 3rd trimesters of pregnancy?
300 calories
What is the primary function of progesterone during pregnancy?
To inhibit contractions
What is the name of the stage of childbirth during which the fetal head enters the canal?
Expulsion stage
Learn about the fascinating process of fertilization, where a sperm and an oocyte combine to form a new cell called a zygote. Discover how millions of sperm are eliminated due to acidity, cervical mucus, and immune cells, and how the surviving sperm make their way to the fallopian tubes to fertilize the egg.
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